Issue #1919934 by larowlan: Change key of custom block vertical tabs to use...

Issue #1919934 by larowlan: Change key of custom block vertical tabs to use 'advanced' instead of 'additional_settings()'.

core/modules/block/custom_block/lib/Drupal/custom_block/CustomBlockFormController.php

@@ -80,7 +80,7 @@ public function form(array $form, array &$form_state, EntityInterface $block) {
       '#access' => isset($language_configuration['language_show']) && $language_configuration['language_show'],
     );
 
-    $form['additional_settings'] = array(
+    $form['advanced'] = array(
       '#type' => 'vertical_tabs',
       '#weight' => 99,
     );
@@ -93,7 +93,7 @@ public function form(array $form, array &$form_state, EntityInterface $block) {
       '#collapsible' => TRUE,
       // Collapsed by default when "Create new revision" is unchecked.
       '#collapsed' => !$block->isNewRevision(),
-      '#group' => 'additional_settings',
+      '#group' => 'advanced',
       '#attributes' => array(
         'class' => array('custom-block-form-revision-information'),
       ),