Bug 9834: Preserve biblio level hold preference on reverting waiting status

Bug 9834: Preserve biblio level hold preference on reverting waiting status

When the waiting status of a hold is revert we want to preserve the
level hold preference of the user.

Test plan:
Place a hold at biblio level
Confirm the hold
Revert the waiting hold

=> The hold must still be considered as a biblio level hold ("next
available item")

Signed-off-by: Liz Rea <wizzyrea@gmail.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>