Bug 18279: Remove C4::Items::GetLostItems

Bug 18279: Remove C4::Items::GetLostItems

The JOIN done by this subroutine are not always useful (depending on
item-level_itypes). They also search with LIKE when it is not needed.

Since we have now Koha::Items, we can replace this subroutine with a
call to Koha::Items->search with the correct parameters.

A change in previous behaviours can happen: If a items.itemlost contains
a value that is not defined as a LOST authorised value, the item will
not be displayed. I think it's the expected behaviour, even if it should
not happen in correctly configured installations.

Test plan:
To test with item-level_itypes set to item and biblio:
List the lost items you have on your system, using the different
filters available.
The result table should contain the correct item's info.

Followed test plan, works as expected.
Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>