ISTWCMS-4847: updating add classes to all non-node pages so that proper width is displayed

uw_fdsu_theme_resp.theme

@@ -104,10 +104,11 @@ function uw_fdsu_theme_resp_preprocess_region(&$variables) {
   if ($region == 'content') {
 
     // Get the route name.
-    $route_name = \Drupal::request()->attributes->get('_route');
+    $route_match = \Drupal::routeMatch();
 
-    // If we are on 404 page add appropriate classes to show proper width.
-    if ('system.404' === $route_name) {
+    // If we are on not on a node, add appropriate classes to show
+    // proper width.
+    if ($route_match->getRouteName() !== 'entity.node.canonical') {
       $variables['classes'][] = 'layout';
       $variables['classes'][] = 'uw-contained-width';
     }