message: mavlink_commands: fix placeholders syntax
diff: @@ -37,7 +37,7 @@ MavlinkCommands::Result MavlinkCommands::send_command(uint16_t command,
  _promise_state = PromiseState::BUSY;
  queue_command_async(command, params, target_system_id, target_component_id,
  std::bind(&MavlinkCommands::_promise_receive_command_result,
  - this, std::placeholders_1, std::placeholders_2));
  + this, std::placeholders::_1, std::placeholders::_2));
  }
  while (true) {
  {
  