Bug 24844: Focus syspref searchbar

Bug 24844: Focus syspref searchbar

To test:
1) Go to Administration
2) Notice neither of the syspref search bars are focussed so you have to
click inside one to begin searching
3) Apply patch and refresh page
4) Notice the header syspref search bar is now focussed so you can begin
typing straight away

Sponsored-by: Catalyst IT
Signed-off-by: Sally <sally.healey@cheshiresharedservices.gov.uk>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>