Drop promotion validation on PromotionRule

specs break with it enabled ..
routes.eval_block was made private api

as of https://github.com/rails/rails/commit/d2d33769030b3a560bdbc9c33e7c189274a0dc3a
Less hacky `default_with` override version

Only reason to override this method appears to be adding the
`action_name` value to options passed onto `responder.call`