[Perl/perl5] b9382a: lib/locale_threads.t: Change variable names

[Karl Williamson via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: b9382a43dcb2b07b7baeb88401cad46ca283dc61
      
https://github.com/Perl/perl5/commit/b9382a43dcb2b07b7baeb88401cad46ca283dc61
  Author: Karl Williamson <k...@cpan.org>
  Date:   2024-02-15 (Thu, 15 Feb 2024)

  Changed paths:
    M lib/locale_threads.t

  Log Message:
  -----------
  lib/locale_threads.t: Change variable names

Using 'set' as opposed to 'group' is clearer.