Allow trains to reverse in station when front is in a bridge/tunnel

src/train_cmd.cpp

@@ -3282,7 +3282,7 @@ bool TryPathReserve(Train *v, bool mark_as_stuck, bool first_tile_okay)
 static bool CheckReverseTrain(const Train *v)
 {
 	if (_settings_game.difficulty.line_reverse_mode != 0 ||
-			v->track == TRACK_BIT_DEPOT || v->track & TRACK_BIT_WORMHOLE) {
+			v->track == TRACK_BIT_DEPOT) {
 		return false;
 	}