[-] BO: Fix AdminCustomerThread filters

git-svn-id: http://dev.prestashop.com/svn/v1/branches/1.5.x@13165 b9a71923-0436-4b27-9f14-aed3839534dd

controllers/admin/AdminCustomerThreadsController.php

@@ -115,7 +115,8 @@ class AdminCustomerThreadsControllerCore extends AdminController
 			),
 			'date_upd' => array(
 				'title' => $this->l('Last message'),
-				'width' => 90
+				'width' => 90,
+				'havingFilter' => true
 			)
 		);