Issue #1865926 by damiankloip: Don't need to call parent::setData() in...

Issue #1865926 by damiankloip: Don't need to call parent::setData() in AjaxResponse::prepare() method.

core/lib/Drupal/Core/Ajax/AjaxResponse.php

@@ -55,8 +55,7 @@ public function addCommand($command, $prepend = FALSE) {
    *   Response The current response.
    */
   public function prepare(Request $request) {
-
-    parent::setData($this->ajaxRender($request));
+    $this->setData($this->ajaxRender($request));
     return parent::prepare($request);
   }