Fix a258833: Don't invalidate station list on vehicle load/unload. (#12112)

a258833 fixed a bug but as a result causes the station list to be rebuilt every time (once per game tick) a vehicle loads/unloads.

Instead just mark the window for redraw.

src/economy.cpp

@@ -1942,7 +1942,7 @@ static void LoadUnloadVehicle(Vehicle *front)
 	if (dirty_station) {
 		st->MarkTilesDirty(true);
 		SetWindowDirty(WC_STATION_VIEW, st->index);
-		InvalidateWindowData(WC_STATION_LIST, st->owner);
+		SetWindowDirty(WC_STATION_LIST, st->owner);
 	}
 }