Import adjacent crossings patch (v3.1)

Fix trailing whitespace

http://www.tt-forums.net/viewtopic.php?p=836749#p836749

src/pbs.cpp

@@ -107,8 +107,7 @@ bool TryReserveRailTrack(TileIndex tile, Track t, bool trigger_stations)
 		case MP_ROAD:
 			if (IsLevelCrossing(tile) && !HasCrossingReservation(tile)) {
 				SetCrossingReservation(tile, true);
-				BarCrossing(tile);
-				MarkTileDirtyByTile(tile); // crossing barred, make tile dirty
+				UpdateLevelCrossing(tile, false);
 				return true;
 			}
 			break;