Bug 17251: Koha::AuthorisedValues - Remove GetKohaAuthorisedValuesMapping

Bug 17251: Koha::AuthorisedValues - Remove GetKohaAuthorisedValuesMapping

This subroutine was only used once in GetItemsForInventory.
It can be replaced with a quite simple search on AV join on
authorised_value_categories and marc_subfield_structures tables.

Note that the "interface" parameter was always set to "staff" and was
useless.

Test plan:
Play with the inventory and confirm that the AV descriptions are
correctly displayed.

The tests in t/db_dependent/Items/GetItemsForInventory.t cover this
change and should still pass.

Signed-off-by: Claire Gravely <claire_gravely@hotmail.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>