FIx remaining lint problems in renderer.js
FIx remaining lint problems in renderer.js

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