Fix memory leak with the <EasterEggUsername/>

[zbreit]

When you log out while the <EasterEggUsername/> is active, there is a memory leak because the colors are trying to toggle while the component is unmounted.

Doing this will probably involve using the useIsFocused() hook and wrapping the setState() calls w/ if (isFocused) {...}. That will require this component to be refactored into a modular component.