Bug 10171: (QA followup) Make search tests use the right form

Bug 10171: (QA followup) Make search tests use the right form

This bug removed the search tab from the main search box, so the tests
that use /cgi-bin/koha/catalogue/search.pl for searching, should use
the advanced search box instead.

To test:
- Run
  $ prove t/db_dependent/www/search_utf8.t
=> FAIL: Several tests related to searching on the intranet interface fail.
- Apply the patch
- Run
  $ prove t/db_dependent/www/search_utf8.t
=> SUCCESS: Tests pass
- Be happy

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>