Change tests to check permissions_field name
Change tests to check permissions_field name

A comment on this group of changes mentioned the
'name' attribute of checkboxes for the
permissions_field should be checked as well as the
'value' attribute:

https://github.com/alphagov/notifications-admin/pull/3535#discussion_r460869797

This adds checks to support that point.

alphagov/notifications-admin,alphagov/notifications-admin,alphagov/notifications-admin,alphagov/notifications-admin