Stop wrapping RoundedHomepageIcon if it's already wrapped.

On homepage, if an icon is already wrapped in RoundedHomepageIcon, we
shouldn't wrap it more. Otherwise each time we do this it will add a few
dp padding around the bitmap.

Change-Id: I5313a38f4bd128272d7b4e05209aaee72c690c55
Fixes: 73295342
Test: robotest