message: fixed SetTakeoffAltitude to include action result in response
diff: @@ -174,7 +174,15 @@ public:
  {
  if (request != nullptr) {
  const auto requested_altitude = request->altitude();
  - _action.set_takeoff_altitude(requested_altitude);
  + mavsdk::Action::Result action_result = _action.set_takeoff_altitude(requested_altitude);
  +
  + if (response != nullptr) {
  + auto* rpc_action_result = new rpc::action::ActionResult();
  + rpc_action_result->set_result(
  + static_cast<rpc::action::ActionResult::Result>(action_result));
  + rpc_action_result->set_result_str(mavsdk::Action::result_str(action_result));
  + response->set_allocated_action_result(rpc_action_result);
  + }
  }
  return grpc::Status::OK;
  