Bug 33493: Add a filter relationship for branchtransfers

Bug 33493: Add a filter relationship for branchtransfers

Prefetching is useful, but we don't want to fetch all the inactive
transfers for an item. This patch adds a filtered relationship and
updates get_transfer(s) to use this

To test:
prove -v t/db_dependent/Koha/Item.t

Signed-off-by: David Nind <david@davidnind.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 6c2e092d5b120d251e161ab914ce342fddd35a5a)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>