Issue #3321521 by danmer, heddn: Move group menu permission to yml file, since...

Issue #3321521 by danmer, heddn: Move group menu permission to yml file, since we don't have it by bundle

group_content_menu.group.permissions.yml

+access group content menu overview:
+  title: Access group content menu overview
+  description: Access the overview of all menus
+
+manage group_content_menu:
+  title: Manage menus
+  description: Create, update and delete menus
+  restrict access: true
+
+manage group_content_menu menu items:
+  title: Manage menu items
+  description: Create, update and delete menu items within group menus

src/Plugin/GroupContentMenuPermissionProvider.php

@@ -22,22 +22,7 @@ class GroupContentMenuPermissionProvider extends GroupContentPermissionProvider
    * {@inheritdoc}
    */
   public function buildPermissions() {
-    $permissions = [];
-
-    $permissions['access group content menu overview'] = $this->buildPermission(
-      'Access group content menu overview',
-      'Access the overview of all menus'
-    );
-    $permissions['manage group_content_menu'] = $this->buildPermission(
-      'Manage menus',
-      'Create, update and delete menus'
-    );
-    $permissions['manage group_content_menu menu items'] = $this->buildPermission(
-      'Manage menu items',
-      'Create, update and delete menu items within group menus'
-    );
-
-    return $permissions;
+    return [];
   }
 
 }