message: fix ftp_server example compile issues after renaming
diff: @@ -48,11 +48,12 @@ int main(int argc, char** argv)
  System& system_cc = mavsdk.system();
  auto ftp_server = std::make_shared<Ftp>(system_cc);
  - ftp_server->set_root_dir(argv[3]);
  + ftp_server->set_root_directory(argv[3]);
  std::cout << NORMAL_CONSOLE_TEXT << "Mavlink FTP server running." << std::endl
  << "Remote: " << argv[1] << ":" << argv[2] << std::endl
  - << "Component ID: " << static_cast<int>(ftp_server->get_our_compid()) << std::endl;
  + << "Component ID: " << static_cast<int>(ftp_server->get_our_component_id().second)
  + << std::endl;
  for (;;) {
  std::this_thread::sleep_for(std::chrono::seconds(1));
  