Bug 21353: Display checkboxes to merge patron even if cannot manage lists

Bug 21353: Display checkboxes to merge patron even if cannot manage lists

When permission 'manage_patron_lists' is off, there is no checkbox on
/cgi-bin/koha/members/member.pl to merge patrons.

Test plan:
Remove permission manage_patron_lists
Add permission edit_borrowers
Search for patrons
=> Without this patch you will not be able to select patrons to merge
(checkboxes are not displayed)

Signed-off-by: Séverine QUEUNE <severine.queune@bulac.fr>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>