Use www-origin in integration
Use www-origin in integration

https://github.com/alphagov/govuk-puppet/pull/8328 switched all environments to use `www` rather than `www-origin` for the website root, which is used by Plek. However, `www` in integration currently has some unresolved issues, so override this config in integration only to use `www-origin`.

alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet