message: fix: underlying-proxy in custom format
diff: @@ -203,7 +203,7 @@ export const getSurgeNodes = function(
  config.method,
  config.password,
  'https://raw.githubusercontent.com/ConnersHua/SSEncrypt/master/SSEncrypt.module',
  - ...pickAndFormatStringList(config, ['udp-relay', 'obfs', 'obfs-host', 'tfo']),
  + ...pickAndFormatStringList(config, ['udp-relay', 'obfs', 'obfs-host', 'tfo', 'underlying-proxy']),
  ...(typeof config.mptcp === 'boolean' ? [
  `mptcp=${config.mptcp}`,
  ] : []),
  