t/002_common/024_txn_scope.t fails on win32 (cpan-testers issue)

[spechenin]

Failing test:
t/002_common/024_txn_scope.t , line 41
like $warning, qr{Guard created at .?/?t/002_common/024_txn_scope.t line 32};

Reason:
win32 paths look like "path\to\directory" while "path/to/directory" was expected, note that separators differ.

Proposed fix:
like $warning, qr{\QGuard created at $0 line 32};