Check permission to the mail instead of the sites module

Author: helmo

interface/web/mail/backup_stats.php

@@ -9,7 +9,7 @@
 ******************************************/
 
 //* Check permissions for module
-$app->auth->check_module_permissions('sites');
+$app->auth->check_module_permissions('mail');
 
 $app->load('listform_actions','functions');