Bug 19415: FindDuplicateAuthority is searching on biblioserver since 16.05

Bug 19415: FindDuplicateAuthority is searching on biblioserver since 16.05

Commit b4392018bc1f9bf6a2f7dfe70b488856ad3a3897 [Bug 12478: make things using SimpleSearch use the new version] changed sub FindDuplicateAuthority and replaced this call (from 3.22.x) in 16.05 (pushed April 2016):
    my ($error, $results, $total_hits) = C4::Search::SimpleSearch( $query, 0, 1, [ "authorityserver" ] );

The new call does unfortunately not include the authorityserver:
    my ($error, $results, $total_hits) = $searcher->simple_search_compat( $query, 0, 1 );
Simple_search_compat redirects to C4/Search/SimpleSearch and SimpleSearch assumes a biblioserver if no server is passed.

This effectively makes FindDuplicateAuthority useless since we will no longer find duplicates and we could see an error like this in the log:
    16:51:42-04/10 zebrasrv(51) [request] Search biblios ERROR 114 1 1+0 RPN @attrset Bib-1 @and @attr 1=authtype PERSO_NAME @attr 1=Heading Moerenhout

The fix is obviously trivial.

Test plan:
[1] Go to Authorities.
[2] Add a new authority PERSO_NAME with 100a Moerenhout.
[3] Repeat step 2. Verify that you get the duplicate authority warning.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>