message: mavsdk_server: fix binary name in usage
diff: static auto constexpr default_connection = "udp://:14540";
  static auto default_mavsdk_server_port = 0;
  -static void usage();
  +static void usage(const char* bin_name);
  static bool is_integer(const std::string& tested_integer);
  int main(int argc, char** argv)
  @@ -19,11 +19,11 @@ int main(int argc, char** argv)
  const std::string current_arg = argv[i];
  if (current_arg == "-h" || current_arg == "--help") {
  - usage();
  + usage(argv[0]);
  return 0;
  } else if (current_arg == "-p") {
  if (argc <= i + 1) {
  - usage();
  + usage(argv[0]);
  return 1;
  }
  @@ -31,7 +31,7 @@ int main(int argc, char** argv)
  i++;
  if (!is_integer(port)) {
  - usage();
  + usage(argv[0]);
  return 1;
  }
  @@ -45,10 +45,10 @@ int main(int argc, char** argv)
  mavsdk_server_attach(mavsdk_server);
  }
  -void usage()
  +void usage(const char* bin_name)
  {
  - std::cout << "Usage: mavsdk_server_bin [-h | --help]" << std::endl
  - << " mavsdk_server_bin [-p mavsdk_server_port] [Connection URL]" << std::endl
  + std::cout << "Usage: " << bin_name << " [-h | --help]" << std::endl
  + << " " << bin_name << " [-p mavsdk_server_port] [Connection URL]" << std::endl
  << std::endl
  << "Connection URL format should be:" << std::endl
  << " Serial: serial:///path/to/serial/dev[:baudrate]" << std::endl
  