bau: set button id for acceptance tests
bau: set button id for acceptance tests

Acceptance tests are failing because the button for the redirect on no  JS had a different id name.

Authors: 97badde7b450d6bd1dcfb2f4a3a83a1b8282cd4d@chrisholmes

alphagov/verify-frontend,alphagov/verify-frontend,alphagov/verify-frontend,alphagov/verify-frontend