Hide 'TLS policy maps'-Tab from Domainadmins

The tabpanel is already hidden, but the nav-tab was still visible.

data/web/mailbox.php

@@ -21,7 +21,7 @@ $_SESSION['return_to'] = $_SERVER['REQUEST_URI'];
     <li role="presentation"><a href="#tab-syncjobs" aria-controls="tab-syncjobs" role="tab" data-toggle="tab"><?=$lang['mailbox']['sync_jobs'];?></a></li>
     <li role="presentation"><a href="#tab-filters" aria-controls="tab-filters" role="tab" data-toggle="tab"><?=$lang['mailbox']['filters'];?></a></li>
     <li role="presentation"><a href="#tab-bcc" aria-controls="tab-filters" role="tab" data-toggle="tab"><?=$lang['mailbox']['address_rewriting'];?></a></li>
-    <li role="presentation"><a href="#tab-tls-policy" aria-controls="tab-tls-policy" role="tab" data-toggle="tab"><?=$lang['mailbox']['tls_policy_maps'];?></a></li>
+    <li role="presentation"<?=($_SESSION['mailcow_cc_role'] == "admin") ?: ' class="hidden"';?>><a href="#tab-tls-policy" aria-controls="tab-tls-policy" role="tab" data-toggle="tab"><?=$lang['mailbox']['tls_policy_maps'];?></a></li>
   </ul>
 
 	<div class="row">