IRIS checkout: do not overwrite HAFAS route with IRIS route

The IRIS route may differ from the HAFAS route in case of diversions,
causing travelynx to lose real-time data, coordinates, and polyline when
the follow-up add_route_timestamps call is not made.

lib/Travelynx.pm

@@ -910,7 +910,6 @@ sub startup {
 								uid   => $uid,
 								db    => $db,
 								train => $train,
-								route => [ $self->iris->route_diff($train) ]
 							);
 
 							$has_arrived

lib/Travelynx/Model/InTransit.pm

@@ -483,13 +483,6 @@ sub set_arrival {
 	my $uid   = $opt{uid};
 	my $db    = $opt{db} // $self->{pg}->db;
 	my $train = $opt{train};
-	my $route = $opt{route};
-
-	$route = $self->_merge_old_route(
-		db    => $db,
-		uid   => $uid,
-		route => $route
-	);
 
 	my $json = JSON->new;
 
@@ -500,7 +493,6 @@ sub set_arrival {
 			arr_platform  => $train->platform,
 			sched_arrival => $train->sched_arrival,
 			real_arrival  => $train->arrival,
-			route         => $json->encode($route),
 			messages      => $json->encode(
 				[ map { [ $_->[0]->epoch, $_->[1] ] } $train->messages ]
 			)