[ticket/11533] Columns counter for notification settings

Add columns counter template variable. It counts number of
notification types + column for name + column for checkbox

PHPBB3-11533

phpBB/includes/ucp/ucp_notifications.php

@@ -200,6 +200,10 @@ class ucp_notifications
 				}
 			}
 		}
+
+		$template->assign_vars(array(
+			strtoupper($block) . '_COLS' => sizeof($notification_methods) + 2,
+		));
 	}
 
 	/**