Bug 28946: (bug 23271 follow-up) Missing occurrence in add_user_search.pl

Bug 28946: (bug 23271 follow-up) Missing occurrence in add_user_search.pl

commit f6e0b04f48e8f0a02dbb8d48152646257d9accba
Bug 23271: Replace search_limited with search_with_library_limits

We were modifying the occurrences of:
  Koha::Patron::Categories->search_limited;
with:
  Koha::Patron::Categories->search_with_library_limits;

But between the patch submission and the push, another occurrence has
been added by bug 23590.

Test plan:
Create a new suggestion from staff and click "select manager"
Without the patch, notice the error:
  The method Koha::Patron::Categories->search_limited is not covered by tests!
With the patch applied everything is working correctly

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>