Make sure favicon is available in production
Make sure favicon is available in production

Due to a change between Rails 4.2.5 and 4.2.5.1, this was causing an
error when running tests.

ministryofjustice/prison-visits-public,ministryofjustice/prison-visits-public,ministryofjustice/prison-visits-public,ministryofjustice/prison-visits-public