telnetd: Enable autologin in legacy mode.

Without authentication, autologin was broken. Bug reported by Kuaikuai Wu to the list in `2014-12/msg00010.html'.


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[
  {
    "ref": [
      "https://codeberg.org/inetutils/inetutils/commit/fa3245ac8c288b87139a0da8249d0a408c4dfb87"
    ]
  }
]