Bug 10425 - Help page missing for Local Use preferences

Bug 10425 - Help page missing for Local Use preferences

When viewing Local Use system preferences tab, the help button will lead to an error page.
This is because Local Use tab uses not the same script has other tabs : systempreferences.pl.

This patch adds help/systemprefences.tt

Test plan :
- Go to Local Use preferences : /cgi-bin/koha/admin/systempreferences.pl
- Click on Help link (at right top)
- See you get the same page as other preferences tab help

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>