Bug 15221: (QA follow-up) Fix Message.t

Bug 15221: (QA follow-up) Fix Message.t

As Jonathan reported on comment11, SIP/Message.t fails now.

This is a trivial fix for that. In the first case we should just no longer
expect the alert flag. In the second case it makes more sense to toggle
the value of the checked_in_ok setting.

Test plan:
Run t/db_dependent/SIP/Message.t

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
(cherry picked from commit 533ff7ab29a1ca6d35d0e306dd97273838ad3064)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>