Basic test for Hart cobrand
[Hart] make sure #map_box not in desk-only

Fixing a Javascript error:
https://github.com/mysociety/FixMyStreet-Commercial/issues/470
[Hart] wrapper class tweak, to avoid duplicate map

js code expects there to be only one .wrapper, which has the #map_box
attached to it.
[Hart] remove unneeded base_url

This allows the inherited method to Do The Right Thing with
redirects to problems logged for the surrounding authority
(Hampshire in this case)