Bug 33634: Correct anchors in system preference submenu

Bug 33634: Correct anchors in system preference submenu

To test:
1. Go to Koha Administration -> Global system preferences
2. Go to a tab with a few headings like Circulation
3. Click on a heading in the sidebar navigation under Circulation that takes you a bit down the page, like Recalls
4. Notice this anchor link does not work, you are not taken to the recalls preferences
5. Apply patch
6. Try again, the links should take you to the proper place.

Signed-off-by: Barbara Johnson <barbara.johnson@bedfordtx.gov>
Signed-off-by: Aleisha Amohia <aleishaamohia@hotmail.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>