Merge branch '5962-backup-stats-not-shown-for-admin' into 'develop'

Show backup stats to admin (#5962)

Closes #5962

See merge request ispconfig/ispconfig3!1350

Author: Marius Burkard

interface/web/sites/lib/module.conf.php

@@ -213,7 +213,7 @@
 	'link'    => 'sites/database_quota_stats.php',
 	'html_id' => 'databse_quota_stats');
 
-if($app->auth->get_client_limit($userid, 'backup') == 'y') {
+if($app->auth->get_client_limit($userid, 'backup') != 'n') {
         $items[] = array (
                 'title'   => 'Backup Stats',
                 'target'  => 'content',