Bug 32993: Holds priority changed incorrectly with dropdown selector

Bug 32993: Holds priority changed incorrectly with dropdown selector

Test Plan:
1) Find record with at least 3 holds.
2) Change first holds priority as 2, Priority is changed to 3.
3) Try to change priority back to 1, Priority is changed to 2.
4) Apply this patch
5) Reload the page
2) Change first holds priority as 2, Priority is changed to 2.
3) Try to change priority back to 1, Priority is changed to 1.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Emmi Takkinen <emmi.takkinen@koha-suomi.fi>
Signed-off-by: Hinemoea Viault <hinemoea.viault@inlibro.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit 7d9e4cf41515234d8d61c369aab3c3e49be1ac3d)
Signed-off-by: Matt Blenkinsop <matt.blenkinsop@ptfs-europe.com>