ISTWCMS-5412: adding correct variable for pub ref keywords block

src/Plugin/Block/PublicationKeywordsBlock.php

@@ -28,6 +28,13 @@ class PublicationKeywordsBlock extends BlockBase implements ContainerFactoryPlug
    */
   protected $entityTypeManager;
 
+  /**
+   * The current user.
+   *
+   * @var \Drupal\Core\Session\AccountProxyInterface
+   */
+  protected $currentUser;
+
   /**
    * {@inheritdoc}
    */