Bug 31886: Fix no sidebar problem in system pref search

Bug 31886: Fix no sidebar problem in system pref search

To test:
1. Go to Adminstration and click on 'Global system preferences'
2. From the left side bar click 'I18N/L10N' and notice no sidebar.
3. Also try 'Serials', no sidebar
4. Apply patch, restart_all
5. Try 1 & 2 again and the sidebar should be restored
6. Try clicking through each of the system preference groups (Accounting, Acquisitions, etc ) and make sure the sidebar is always present.

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>