Merge pull request #4393 from owncloud/fix_4326

provide correct path for require_once

* owncloud/fix_4326:
  use __DIR__ instead of realpath
  provide correct path for require_once

apps/files_encryption/files/error.php

 <?php
 if (!isset($_)) { //also provide standalone error page
-	require_once '../../../lib/base.php';
+	require_once __DIR__ . '/../../../lib/base.php';
 
 	$l = OC_L10N::get('files_encryption');