Repair Mail Orga filter

registration-system/admin/pages_mail.php

@@ -188,7 +188,7 @@ class AdminMailPage extends AdminPage {
                 $where['backstepped' . ($_REQUEST['val_backstepped'] == 1 ? '[!]' : '')] = null;
             }
             if (isset($_REQUEST['check_isOrga'])) {
-                $where['isOrga' . ($_REQUEST['val_isOrga'] == 1 ? '[!]' : '')] = null;
+                $where['isOrga'] = $_REQUEST['val_isOrga'];
             }
             if (isset($_REQUEST['check_wasOnWaitlist'])) {
                 if($_REQUEST['val_wasOnWaitlist'] == 1) {