Remove system from list of apps

 $if tx.user.is_owner:
     <ul class=admin>
     $for mount_name, mount_app in sorted(tx.app.mounts):
-        $if mount_name in public_apps:
+        $if mount_name in public_apps or mount_name == "system":
             $continue
         <li><a href=/$mount_app.prefix>$mount_name.capitalize()</a></li>
     </ul>