Bug 28299: Make buildKohaItemsNamespace accept Koha::Items

Bug 28299: Make buildKohaItemsNamespace accept Koha::Items

This patch makes buildKohaItemsNamespace (and its only caller,
XSLTParse4Display) accept a an optional Koha::Items resultset.

This way we don't need to calculate (from the DB) the list of hidden
itemnumbers, but solve it in one query.

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>