fix(VertexBuffer): simplify the assign statement in the instantDivisor
fix(VertexBuffer): simplify the assign statement in the instantDivisor

BabylonJS/Babylon.js,sebavan/Babylon.js,sebavan/Babylon.js,RaananW/Babylon.js,sebavan/Babylon.js,RaananW/Babylon.js,RaananW/Babylon.js,BabylonJS/Babylon.js,BabylonJS/Babylon.js