Replaced another rename function.

h5p.classes.php

@@ -1327,7 +1327,8 @@ class H5PStorage {
 
       // Move the content folder
       $destination_path = $contents_path . DIRECTORY_SEPARATOR . $contentId;
-      @rename($current_path, $destination_path);
+      $this->h5pC->copyFileTree($current_path, $destination_path);
+      H5PCore::deleteFileTree($current_path);
 
       // Save the content library dependencies
       $this->h5pF->saveLibraryUsage($contentId, $librariesInUse);