Remove obsolete code no longer needed in new service provider

[JustinPihony]

HTTPS redirects are now enabled, so the HTTPS check can be removed from the filter. Per James:

We had this because Heroku didn't offer any redirects at the routing layer, but in my opinion HTTPS redirection is a routing concern that the app should not deal with if it can avoid it. This would also mean you can remove the special handling of the healthcheck in that filter. Likewise, if we can remove the reactivemanifesto.org to www.reactivemanifesto.org redirect, that would be ideal, then I guess we can remove the filter altogether.