Bug 30856: Remove C4::Reserves::CanReserveBeCanceledFromOpac

Bug 30856: Remove C4::Reserves::CanReserveBeCanceledFromOpac

This subroutine can easily be replaced and is not really needed.

Test plan:
No changes expected, try to suspend/resume holds from the OPAC

Note that you cannot affect somebody's else holds.

Note for QA: The extra fetch of Koha::Hold will be removed on bug 37868.

Signed-off-by: Olivier V <olivier.vezina@inLibro.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>