Callback fired twice in hooks example

Hello. Thanks for your work!
In hooks example `handleChange` callback called twice.
My assumption because of:
1. For click on color
2. state update -> component update

Start by locating the hooks example and its handleChange callback, then reproduce the issue by clicking a color and observing the state update. Trace whether the click and component update each invoke the callback. Done means the callback fires once for a color change and the example's existing checks still pass.

Written by the indexing model from the issue text.