Bug 35329: Move patron search to modal - edit-batch

Bug 35329: Move patron search to modal - edit-batch

Test plan:
Create new patron card batch
Keep the textarea empty and click "Add patron(s)" to open the modal
There is a special feature here, the "checkbox" column is displayed and
you can select several patrons and click "Add selected patrons".

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>