Only reconfigure layers when the color changes

[jessmartin]

Tip from @soundevolution: "You could make additional improvements by setting a flag in the -setButtonColor: method so that the layers are only reconfigured when the colour changes instead of doing it on every layout (which happens quite often when a view is a being animated.)."

[Hackmodford]

Would that explain why my view is kinda laggy when being popped into existence?