Bug 24964: Restore pagination for patrons for owner/users of funds

Bug 24964: Restore pagination for patrons for owner/users of funds

admin/add_user_search.pl sets 'patrons_with_acq_perm_only', to only
retrieve patrons with acq (order_manage) permissions.

The original bug was hidden in the existing code, but the behavior was
terrible.
To prevent patrons matching the permissions contrainst to be hidden, we
fetched ALL the patrons from the DB, then filtered them depending on
their permissions. This might have awful performance on DB with lot of
patrons.

So basically with this patch we are adding the pagination back to the
"owner/users for funds" feature, as the permission filtering is now done
at DB level.

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>