Corrects NoteFormat dx generaion on chords
Corrects NoteFormat dx generaion on chords

grame-cncm/libmusicxml,grame-cncm/libmusicxml,arshiacont/libmusicxml,grame-cncm/libmusicxml,dfober/libmusicxml,arshiacont/libmusicxml,dfober/libmusicxml,dfober/libmusicxml,dfober/libmusicxml,arshiacont/libmusicxml,grame-cncm/libmusicxml,grame-cncm/libmusicxml,arshiacont/libmusicxml,grame-cncm/libmusicxml,arshiacont/libmusicxml