[BUGFIX beta] HashLocation no longer looks the hash up with location.hash because of a Firefox decode bug. Fixes #4262

HashLocation no longer looks the hash up with location.hash because of a Firefox decode bug. Fixes #4262

https://github.com/emberjs/ember.js/pull/4008 fixed this [here](https://github.com/emberjs/ember.js/blob/master/packages/ember-routing/lib/location/hash_location.js#L31), but since the `query-params-new` feature may or may not land in a stable release for some time, I think this should be fixed separately without being behind that feature flag.