In code, is correct, but log file has _ on final

Apologies, it wasn't that then!

See bug 33412 https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=33412

The code used to fix the issue (bug is signed off, but has not passed QA or been pushed yet):
$overlay_framework = undef if $overlay_framework eq '_USE_ORIG';