Bug 17196: Fix query builder for item search

Bug 17196: Fix query builder for item search

The item search needs to join on biblio_metadata to allow search on
marcxml field

Test plan:
Launch complex item searches (using marc fields).

Signed-off-by: Mason James <mtj@kohaaloha.com>
Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Zeno Tajoli <z.tajoli@cineca.it>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>