Update input/regression/music-function.ly
This test defined a music function like \bar, but \bar was reimplemented in ce27e1a17a76ff13ed4461bb5018267b7ed0faefa. Restore the similarity.
This test defined a music function like \bar, but \bar was reimplemented in ce27e1a17a76ff13ed4461bb5018267b7ed0faefa. Restore the similarity.