Bug 24170: Fix sysprefs search result order

Bug 24170: Fix sysprefs search result order

The same sysprefs search will not always return the results in the same
order.
If you search for 'd' in the "search system preferences" box
  /cgi-bin/koha/admin/preferences.pl?op=search&searchfield=d
you will see that the modules are not ordered consistently.

This patch makes them display alphabetically

Test plan:
Search the same string several times in the syspref list.
The search result should always be ordered the same way

Signed-off-by: cori <corilynn.arnold@gmail.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>