Bug 8887: only display desired result when doing exact syspref search

Bug 8887: only display desired result when doing exact syspref search

This patch fixes an issue where entering the complete name of a system
preference when doing a syspref search in the staff interface resulted
in the display of *all* preferences belonging to the desired one's
module.

Since providing a more specific search string should result in getting
back more specific results, the previous behavior was not intuitive.

Test scenario:

a) In sysprefs, do a search with partial match (e.g. intranetcolor)
-> Result shows one entry: intranetcolorstylesheet
b) Do an exact search. e.g. intranetcolorstylesheet
-> Result shows all Staff Client preferences

Apply patch, test again. Now b) behaves like a).

Signed-off-by: Mirko Tietgen <mirko@abunchofthings.net>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Passes koha-qa.pl, works as advertised.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>