Clean marked messages after new uids are fetched.
Commit 5c5158b3 ("store: remove callbacks on error") removed side
effects in the message store after a longer suspend period but neglected
to remove marked zombie messages.
References: https://todo.sr.ht/~rjarry/aerc/28
Co-authored-by: inwit <inwit@sindominio.net>
Signed-off-by: Koni Marti <koni.marti@gmail.com>
Acked-by: Robin Jarry <robin@jarry.cc>