Fix namespace code style of mod_banners

Author: laoneo

modules/mod_banners/Helper/ModBannersHelper.php

@@ -6,6 +6,7 @@
  * @copyright   Copyright (C) 2005 - 2018 Open Source Matters, Inc. All rights reserved.
  * @license     GNU General Public License version 2 or later; see LICENSE.txt
  */
+
 namespace Joomla\Module\Banners\Site\Helper;
 
 defined('_JEXEC') or die;