[Web] Fix container ctrl session

data/web/inc/ajax/container_ctrl.php

@@ -1,5 +1,4 @@
 <?php
-session_start();
 require_once $_SERVER['DOCUMENT_ROOT'] . '/inc/prerequisites.inc.php';
 if (!isset($_SESSION['mailcow_cc_role']) || $_SESSION['mailcow_cc_role'] != 'admin') {
 	exit();