Fix the CI build for the content_schemas jenkins-schema.sh
Fix the CI build for the content_schemas jenkins-schema.sh

- This was causing upstream builds to fail because it didn't pass
  because it was calling the wrong thing. The perils of copy and paste
  from different projects! Thanks, Tijmen!

alphagov/contacts-frontend,alphagov/contacts-frontend,alphagov/contacts-frontend,alphagov/contacts-frontend