3346: support old Feedback page params during deployment
3346: support old Feedback page params during deployment

For ZDD we need to support the old feedback page params for a short period of
time. This commit adds support.

Authors: 4137bc79bfb767817a94734d09d63645ed350e7e@yolinas

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