Ensure backward compatibility for `hel-arabic.ly`
This was missed in commit eb4c902a.
Problem reported in
https://lists.gnu.org/archive/html/lilypond-devel/2024-03/msg00009.html
This was missed in commit eb4c902a.
Problem reported in
https://lists.gnu.org/archive/html/lilypond-devel/2024-03/msg00009.html