[InterNetNews/inn] bcc89b: pullnews: Fix the generation of Xref

[Julien ÉLIE]

  Branch: refs/heads/main
  Home:   https://github.com/InterNetNews/inn
  Commit: bcc89b40646891a3d18d7ecdab9ae89b2bcf6428
      https://github.com/InterNetNews/inn/commit/bcc89b40646891a3d18d7ecdab9ae89b2bcf6428
  Author: Julien ÉLIE <Julien-Elie at users.noreply.github.com>
  Date:   2023-02-06 (Mon, 06 Feb 2023)

  Changed paths:
    M frontends/pullnews.in

  Log Message:
  -----------
  pullnews: Fix the generation of Xref

Remove an unexpected space between the name of a group and
the article number.