Bug 24295: Remove GetTransfers from opac-reserve.pl

Bug 24295: Remove GetTransfers from opac-reserve.pl

This patch replaces the call to GetTransfers in opac-reserve with the
get_transfer method available from the Koha::Item object

Test plan
1/ Place a reserve on an item at a different branch
2/ Trigger the transfer of the item
3/ Check the opac-reserves page for the display of the current transfer
status
4/ Apply patch
5/ Repeat step 3

Rebased-by: Joonas Kylmälä <joonas.kylmala@iki.fi>
Signed-off-by: Joonas Kylmälä <joonas.kylmala@iki.fi>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>