Fix for Bug 2599 - Search limits not working for NoZebra

Fix for Bug 2599 - Search limits not working for NoZebra

Adds the change suggested by Amer Denni to fix Bug 2599
in comment #7 at:

http://bugs.koha.org/cgi-bin/bugzilla3/show_bug.cgi?id=2599

For UNIMARC installations, this patch only works after
updating the "NoZebraIndexes" system preference to
UNIMARC indexes (by default, NoZebraIndexes is being
wrongly set to MARC21 values in UNIMARC installations).

That has also been reported as a Bug, by me (see Bug 2178):

Bug 2178 - "NoZebraIndexes" system preference is being set
to MARC21 values in UNIMARC installations
http://bugs.koha.org/cgi-bin/bugzilla3/show_bug.cgi?id=2178

Signed-off-by: Galen Charlton <galen.charlton@liblime.com>