message: Use CheckDataDirOption() for code uniformity
  All other clients and tools use CheckDataDirOption() rather
  fs::is_directory(GetDataDir(false)) for the first datadir check.
diff: @@ -55,7 +55,7 @@ static bool WalletAppInit(int argc, char* argv[])
  // check for printtoconsole, allow -debug
  LogInstance().m_print_to_console = gArgs.GetBoolArg("-printtoconsole", gArgs.GetBoolArg("-debug", false));
  - if (!fs::is_directory(GetDataDir(false))) {
  + if (!CheckDataDirOption()) {
  tfm::format(std::cerr, "Error: Specified data directory \"%s\" does not exist.\n", gArgs.GetArg("-datadir", "").c_str());
  return false;
  }
  