dbris: /s/: redirect to proper station ID if needed

	  // ( $user->{backend_hafas} ? $user->{backend_name} : undef );

	my $promise;

	if ($dbris_service) {

		if ( $station !~ m{ [@] L = \d+ }x ) {

			$self->render_later;

			$self->dbris->get_station_id_p($station)->then(

				sub {

					my ($dbris_station) = @_;

					$self->redirect_to( '/s/' . $dbris_station->{id} );

				}

			)->catch(

				sub {

					my ($err) = @_;

					$self->redirect_to('/');

				}

			)->wait;

			return;

		}

		$promise = $self->dbris->get_departures_p(

			station    => $station,

			timestamp  => $timestamp,