Fixed static tests.

Author: hostep

app/code/Magento/PageBuilder/Controller/Adminhtml/Stage/Render.php

@@ -1,8 +1,7 @@
 <?php
 /**
- *
- * Copyright © Magento, Inc. All rights reserved.
- * See COPYING.txt for license details.
+ * Copyright 2019 Adobe
+ * All Rights Reserved.
  */
 
 namespace Magento\PageBuilder\Controller\Adminhtml\Stage;
@@ -18,7 +17,7 @@
  */
 class Render extends \Magento\Backend\App\Action implements HttpGetActionInterface
 {
-    const ADMIN_RESOURCE = 'Magento_Backend::content';
+    public const ADMIN_RESOURCE = 'Magento_Backend::content';
 
     /**
      * @var \Magento\Framework\View\Result\PageFactory