[Perl/perl5] b3a0a5: gv.c - use SVf_QUOTEDPREFIX in error message

[Yves Orton via perl5-changes]

  Branch: refs/heads/yves/quoted_prefix_followup
  Home:   https://github.com/Perl/perl5
  Commit: b3a0a5e1356f495dc935458a9ee5b38085e130f8
      
https://github.com/Perl/perl5/commit/b3a0a5e1356f495dc935458a9ee5b38085e130f8
  Author: Yves Orton <demer...@gmail.com>
  Date:   2022-08-26 (Fri, 26 Aug 2022)

  Changed paths:
    M gv.c

  Log Message:
  -----------
  gv.c - use SVf_QUOTEDPREFIX in error message

I overlooked this case when SVf_QUOTEDPREFIX was introduced