Prevent partner's province from updating (OSRA-272)

- change permit_params in app/admin/partner.rb
- add attr_readonly for province in partner model
- add test in partner model spec to check for attributes after update
These strings get chained together per nesting to describe the test.  So this would be `should not change info about associated province should not update province`. What about something like `update` `should not change province'