Remove superfluous origin header check.
Remove superfluous origin header check.

The check failed when wwwhisper was contacted by some node.js backends
that use middleware that incorrectly alters the origin header. Cookie
based cross origin request prevention implemented by wwwhisper is
sufficient witout additional Origin header checks.

wrr/wwwhisper,wrr/wwwhisper,wrr/wwwhisper,wrr/wwwhisper