Bug 25907: When cancelling a waiting hold on returns.pl, looks for new hold to fill...

Bug 25907: When cancelling a waiting hold on returns.pl, looks for new hold to fill without rescanning barcode

Right now, after canceling a hold on the checkin screen, a librarian
needs to rescan the item barcode to check and trap the next hold. This
is an extra unnecessary step.

Test Plan:
1) Place two or more holds on a record
2) Check in the item
3) Confirm the hold
4) Check in the item again
5) Cancel the hold
6) Koha should now display the modal asking to confirm the next hold
   without the need to rescan the barcode!

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Rebecca Coert <rcoert@arlingtonva.us>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>