Merge pull request #1434 from owncloud/trashbin_CSRF

[files_trashbin] Add CSRF token

apps/files_trashbin/ajax/undelete.php

@@ -1,8 +1,7 @@
 <?php 
 
-if(!OCP\User::isLoggedIn()) {
-	exit;
-}
+OCP\JSON::checkLoggedIn();
+OCP\JSON::callCheck();
 
 $files = $_REQUEST['files'];
 $dirlisting = $_REQUEST['dirlisting'];