Remove hard coded notehead widths.
Remove hard coded notehead widths.

Tails/vexflow,aaronmars/vexflow,aaronmars/vexflow,Huji/vexflow,Silverwolf90/vexflow,Huji/vexflow,Silverwolf90/vexflow,Tails/vexflow,aaronmars/vexflow,Tails/vexflow,Silverwolf90/vexflow,Huji/vexflow