Fix go to nearest depot orders using the location of a particular depot

src/order_cmd.cpp

@@ -917,6 +917,7 @@ TileIndex Order::GetLocation(const Vehicle *v, bool airport) const
 			return BaseStation::Get(this->GetDestination())->xy;
 
 		case OT_GOTO_DEPOT:
+			if (this->GetDepotActionType() & ODATFB_NEAREST_DEPOT) return INVALID_TILE;
 			if (this->GetDestination() == INVALID_DEPOT) return INVALID_TILE;
 			return (v->type == VEH_AIRCRAFT) ? Station::Get(this->GetDestination())->xy : Depot::Get(this->GetDestination())->xy;