ISTWCMS-4960: Use #access to remove parts of forms instead of unsetting them

Unsetting can cause empty value to be stored instead of non-empty
default values.

Fixes issues introduced in f16d00b8, 2ae5f344, 8460840b, and 713810bd.

uw_cfg_common.module

@@ -109,7 +109,7 @@ function uw_cfg_common_form_layout_builder_configure_section_alter(array &$form,
  */
 function uw_cfg_common_form_webform_admin_config_submissions_form_alter(array &$form, FormStateInterface $form_state, string $form_id): void {
   // Remove undesired features.
-  unset($form['views_settings']);
+  $form['views_settings']['#access'] = FALSE;
 }
 
 /**
@@ -127,7 +127,7 @@ function uw_cfg_common_form_webform_settings_access_form_alter(array &$form, For
     'configuration',
   ];
   foreach ($sections_to_remove as $section) {
-    unset($form['access'][$section]);
+    $form['access'][$section]['#access'] = FALSE;
   }
 
   // Remove all but user-based access for submissions and test.
@@ -145,7 +145,7 @@ function uw_cfg_common_form_webform_settings_access_form_alter(array &$form, For
   ];
   foreach ($permissions_to_edit as $permission) {
     foreach ($access_types_to_remove as $type) {
-      unset($form['access'][$permission][$type]);
+      $form['access'][$permission][$type]['#access'] = FALSE;
     }
   }
 }
@@ -165,8 +165,8 @@ function uw_cfg_common_form_webform_settings_confirmation_form_alter(array &$for
   unset($form['confirmation_type']['confirmation_type']['#options']['none']);
 
   // Remove undesired features.
-  unset($form['confirmation_attributes_container']);
-  unset($form['back']['back_container']['confirmation_back_attributes_container']);
+  $form['confirmation_attributes_container']['#access'] = FALSE;
+  $form['back']['back_container']['confirmation_back_attributes_container']['#access'] = FALSE;
 }
 
 /**
@@ -176,7 +176,7 @@ function uw_cfg_common_form_webform_settings_confirmation_form_alter(array &$for
  */
 function uw_cfg_common_form_webform_settings_form_alter(array &$form, FormStateInterface $form_state, string $form_id): void {
   // Remove undesired features.
-  unset($form['ajax_settings']);
+  $form['ajax_settings']['#access'] = FALSE;
 }
 
 /**
@@ -186,20 +186,20 @@ function uw_cfg_common_form_webform_settings_form_alter(array &$form, FormStateI
  */
 function uw_cfg_common_form_webform_settings_form_form_alter(array &$form, FormStateInterface $form_state, string $form_id): void {
   // Unset the source entity settings in webforms.
-  unset($form['form_behaviors']['form_prepopulate_source_entity']);
-  unset($form['form_behaviors']['form_prepopulate_source_entity_required']);
-  unset($form['form_behaviors']['form_prepopulate_source_entity_type']);
+  $form['form_behaviors']['form_prepopulate_source_entity']['#access'] = FALSE;
+  $form['form_behaviors']['form_prepopulate_source_entity_required']['#access'] = FALSE;
+  $form['form_behaviors']['form_prepopulate_source_entity_type']['#access'] = FALSE;
 
   // Remove undesired features.
-  unset($form['access_denied']);
-  unset($form['custom_settings']);
-  unset($form['form_behaviors']['form_autofocus']);
-  unset($form['form_behaviors']['form_disable_back']);
-  unset($form['form_behaviors']['form_novalidate']);
-  unset($form['form_behaviors']['form_required']);
-  unset($form['form_behaviors']['form_reset']);
-  unset($form['form_behaviors']['form_submit_back']);
-  unset($form['form_settings']['form_attributes']);
+  $form['access_denied']['#access'] = FALSE;
+  $form['custom_settings']['#access'] = FALSE;
+  $form['form_behaviors']['form_autofocus']['#access'] = FALSE;
+  $form['form_behaviors']['form_disable_back']['#access'] = FALSE;
+  $form['form_behaviors']['form_novalidate']['#access'] = FALSE;
+  $form['form_behaviors']['form_required']['#access'] = FALSE;
+  $form['form_behaviors']['form_reset']['#access'] = FALSE;
+  $form['form_behaviors']['form_submit_back']['#access'] = FALSE;
+  $form['form_settings']['form_attributes']['#access'] = FALSE;
 }
 
 /**
@@ -209,11 +209,11 @@ function uw_cfg_common_form_webform_settings_form_form_alter(array &$form, FormS
  */
 function uw_cfg_common_form_webform_settings_submissions_form_alter(array &$form, FormStateInterface $form_state, string $form_id): void {
   // Remove undesired features.
-  unset($form['access_denied']);
-  unset($form['submission_behaviors']['form_convert_anonymous']);
-  unset($form['submission_behaviors']['submission_log']);
-  unset($form['submission_behaviors']['token_update']);
-  unset($form['views_settings']);
+  $form['access_denied']['#access'] = FALSE;
+  $form['submission_behaviors']['form_convert_anonymous']['#access'] = FALSE;
+  $form['submission_behaviors']['submission_log']['#access'] = FALSE;
+  $form['submission_behaviors']['token_update']['#access'] = FALSE;
+  $form['views_settings']['#access'] = FALSE;
 }
 
 /**
@@ -520,8 +520,8 @@ function uw_cfg_common_form_alter(array &$form, FormStateInterface $form_state,
 
   // ISTWCMS-4648: removing revisions from layout builder page.
   if (\Drupal::routeMatch()->getRouteName() == 'layout_builder.overrides.node.view') {
-    unset($form['revision']);
-    unset($form['advanced']);
+    $form['revision']['#access'] = FALSE;
+    $form['advanced']['#access'] = FALSE;
   }
 
   // Ensure that we are on a UW content type node.