Use 'open' instead of 'live' in test
Use 'open' instead of 'live' in test

Briefs should be described as open instead of live, which has been
changed in the frameworks repo. This updates a test to check the correct
word.

alphagov/digitalmarketplace-buyer-frontend,alphagov/digitalmarketplace-buyer-frontend,alphagov/digitalmarketplace-buyer-frontend,alphagov/digitalmarketplace-buyer-frontend