Fix missed variable rename

Author: merk

EventListener/ViewResponseListener.php

@@ -96,17 +96,17 @@ public function onKernelView(GetResponseForControllerResultEvent $event)
                 $context->setGroups($configuration->getSerializerGroups());
                 $view->setSerializationContext($context);
             }
-            $fillDefaultTemplateVars = $configuration->isPopulateDefaultVars();
+            $populateDefaultVars = $configuration->isPopulateDefaultVars();
         } else {
-            $fillDefaultTemplateVars = true;
+            $populateDefaultVars = true;
         }
 
         if (null === $view->getFormat()) {
             $view->setFormat($request->getRequestFormat());
         }
 
         $vars = $request->attributes->get('_template_vars');
-        if (!$vars && $fillDefaultTemplateVars) {
+        if (!$vars && $populateDefaultVars) {
             $vars = $request->attributes->get('_template_default_vars');
         }