Fix ddd609c: Reverse build probability callback was not called for articulated parts. (#11526)

src/articulated_vehicles.cpp

@@ -431,6 +431,7 @@ void AddArticulatedParts(Vehicle *first)
 
 		if (flip_image) v->spritenum++;
 
+		if (v->type == VEH_TRAIN && TestVehicleBuildProbability(v, v->engine_type, BuildProbabilityType::Reversed)) SetBit(Train::From(v)->flags, VRF_REVERSE_DIRECTION);
 		v->UpdatePosition();
 	}
 }