Pass implicit request to Authorization.isAuthorized method

As described in [SecureSocial issue](https://github.com/jaliss/securesocial/issues/397) we should pass an implicit request to the [Authorization.isAuthorized](https://github.com/mohiva/play-silhouette/blob/master/app/com/mohiva/play/silhouette/core/Authorization.scala#L36) method.