Bug 17177 - about.pl references a module that doesn't exist

To test
1/ Go to the about page, notice error
2/ Apply patch
3/ Notice error gone

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

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>

about.pl

@@ -36,7 +36,6 @@ use C4::Installer;
 use Koha;
 use Koha::Acquisition::Currencies;
 use Koha::Patrons;
-use Koha::Config::SysPrefs;
 use C4::Members::Statistics;
 
 #use Smart::Comments '####';