Bug 31095: Remove GetDebarments from tools/modborrowers.pl

Bug 31095: Remove GetDebarments from tools/modborrowers.pl

This patch removes GetDebarments from the modborrowers tool controller
and replaces it with $patron->restrictions as appropriate.

Test plan
1. Confirm that the 'Batch patron modification' tool pages still load
   and perform as expected.

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>