[ŧicket/11896] Set form_time with time() when marking all notifications read

form_time is only set if is passed via the form. Since the mark notifications
read link does not use the form, it will default to 0 causing the mark
notifications logic to only mark notifications read if their time is smaller
or equal to 0. This patch will change ucp_notifications to correctly set
form_time for the confirm_box.

PHPBB3-11896

phpBB/includes/ucp/ucp_notifications.php

@@ -103,7 +103,7 @@ class ucp_notifications
 					{
 						confirm_box(false, 'NOTIFICATIONS_MARK_ALL_READ', build_hidden_fields(array(
 							'mark'		=> 'all',
-							'form_time'	=> $form_time,
+							'form_time'	=> time(),
 						)));
 					}
 				}