Bug 10330: (follow-up) fix missed case of authoritysep

Bug 10330: (follow-up) fix missed case of authoritysep

$ git grep authoritysep
This showed:
1) the updatedatabase.pl script, as expected,
2) lots of po files,
3) a test file that was missed.

TEST PLAN
---------
1) prove -v t/db_dependent/Search.t
2) Run koha QA test tools

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Work (both patches). Test pass. No koha-qa errors

Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>