Bug 24560: Remove No public list text from OPAC

Bug 24560: Remove No public list text from OPAC

On the OPAC, the dropdown for Lists always includes
the heading Public Lists, even if no public lists exist.
This is sub-optimal for libraries that want VirtualShelves
enabled for private lists but don't want to use public lists.

TEST PLAN:
1. have no public list and look at the List dropdown on the OPAC. It says No Public Lists.
2. Apply patch
3. It should now not say anything about public lists but still be formatted nice.
4. Add some public lists and confirm that everything looks normal.
5. Sign off

Signed-off-by: Andrew Fuerste-Henry <andrew@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>