Bug 28784: (follow-up) Always make three search boxes

Bug 28784: (follow-up) Always make three search boxes

The previous patch removed search_boxes_loop - that's okay, it was always
getting the same three values.

If we don't do something in the template though, we get no boxes

Ultimately this should be a include, and not a hardcoded loop, but keeping changes
small for backporting

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>