monitoring/list/hosts: restore page behaviour

The problem here was that an accidentally removed closing div tag in
15325949 caused the application to missbehave badly. Host details where
rendered below the list in some scenarios and the whole multicolumn
thingy started to feel broken.

modules/monitoring/application/views/scripts/list/hosts.phtml

@@ -135,3 +135,4 @@ if ($hosts->count() === 0) {
     <?php endforeach; ?>
     </tbody>
 </table>
+</div>