Allow drive-through road stops to be one-way

src/saveload/afterload.cpp

@@ -3787,6 +3787,14 @@ bool AfterLoadGame()
 		}
 	}
 
+	if (SlXvIsFeatureMissing(XSLFI_ONE_WAY_DT_ROAD_STOP)) {
+		for (TileIndex t = 0; t < map_size; t++) {
+			if (IsDriveThroughStopTile(t)) {
+				SetDriveThroughStopDisallowedRoadDirections(t, DRD_NONE);
+			}
+		}
+	}
+
 	InitializeRoadGUI();
 
 	/* This needs to be done after conversion. */