Bug 23070: Use Koha::Hold in C4::Reserves::RevertWaitingStatus

Bug 23070: Use Koha::Hold in C4::Reserves::RevertWaitingStatus

We are using raw SQL statements, we should use Koha::Hold instead.

This patch does not seem optimal, we would like to increment priority in
only 1 statement and without the need to fetch and loop all holds.

== Test plan ==
- apply patch
- place some holds on the same record
- check that the priorities look good
- mark one hold as waiting by doing a check-in
- revert the waiting status
- confirm that the priorities are recalculated correctly

Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>