Bug 24506: Multibranch limit does not work with ElasticSearch

Bug 24506: Multibranch limit does not work with ElasticSearch

Test plan
1. Set up a system with ElasticSearch
2. Set up or make sure ther are at least two branches
3. create a group of branches
4. make sure there are items associated with any library in the group
5. make a search in opac limited by the library group
6. make an advanced search in intra limited by the library group
7. change SearchEngine system preference to Zebra and repeat 5. and 6.

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>