[Perl/perl5] 8e2f13: locale.c: Change variable name

[Karl Williamson via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: 8e2f130506f71e820359080127f8b1cf8e36073e
      
https://github.com/Perl/perl5/commit/8e2f130506f71e820359080127f8b1cf8e36073e
  Author: Karl Williamson <k...@cpan.org>
  Date:   2024-01-02 (Tue, 02 Jan 2024)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Change variable name

Use the casing style that was otherwise uniformly used in this file.