Bug 11096: Wrap each test set configuration in Search.t into a subtest

Bug 11096: Wrap each test set configuration in Search.t into a subtest

This makes it easier to read. Also fixes the test count, and is rebased
against 11499 which is needed to correctly test the patches for this bug
(i.e. indexing mode needs to be correctly set in koha-conf.xml)

To test:

[1] Run prove -v t/db_dependent/Search.t

Sponsored-by: Universidad Nacional de Cordoba
Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>