Support SSL in redirect.tmpl

[Routhinator]

SSL Redirects do some funny stuff if you do not turn the engine on and present certs. In my case mail.example.com presented the certs for dev.example.com and failed redirect to mail.example.org because this misconfiguration triggered a browser error.

I've passed the SSL settings through the Formula_Append, however redirect.tmpl should support this as it is required to properly redirect over HTTPS