cifs: use mod_delayed_work() for &server->reconnect if already queued

mod_delayed_work() is safer than queue_delayed_work() if there's a
chance that the work is already in the queue.

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>