message: Fix autostart filenames on Linux
diff: @@ -639,7 +639,7 @@ fs::path static GetAutostartFilePath()
  std::string chain = gArgs.GetChainName();
  if (chain == CBaseChainParams::MAIN)
  return GetAutostartDir() / "bitcoin.desktop";
  - return GetAutostartDir() / strprintf("bitcoin-%s.lnk", chain);
  + return GetAutostartDir() / strprintf("bitcoin-%s.desktop", chain);
  }
  bool GetStartOnSystemStartup()
  