Revert assign_to_seat_group order on subway train

as train_operator on Linuxworks, it often happens that you accidentally manually drive a subway train.
This is more effort to get to the drivers seat, but is how the behavior was for the last 6 months

advtrains_train_subway/init.lua

@@ -55,7 +55,7 @@ advtrains.register_wagon("subway_wagon", {
 			require_doors_open=true,
 		},
 	},
-	assign_to_seat_group = {"dstand", "pass"},
+	assign_to_seat_group = {"pass", "dstand"},
 	doors={
 		open={
 			[-1]={frames={x=0, y=20}, time=1},