winbind: Keep "force_reauth" in invalidate_cm_connection

winbind: Keep "force_reauth" in invalidate_cm_connection

Right now I don't see a way to actually force a re-serverauth
from the client side as long as an entry in netlogon_creds_cli.tdb
exists. cm_connect_netlogon goes through invalidate_cm_connection, and
this wipes our wish to force a reauthenticatoin. Keep this intact until
we actually did reauthenticate.

Bug: https://bugzilla.samba.org/show_bug.cgi?id=13332

Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>