Fix route step lines not being updated when cloning a vehicle's orders.

src/order_gui.cpp

@@ -1484,6 +1484,8 @@ public:
 				share_order ? CMD_CLONE_ORDER | CMD_MSG(STR_ERROR_CAN_T_SHARE_ORDER_LIST) : CMD_CLONE_ORDER | CMD_MSG(STR_ERROR_CAN_T_COPY_ORDER_LIST))) {
 			this->selected_order = -1;
 			ResetObjectToPlace();
+			MarkAllRoutePathsDirty(this->vehicle);
+			MarkAllRouteStepsDirty(this);
 		}
 		return true;
 	}