croupier: Modify Board's Tap targets to workaround Tap Bug
croupier: Modify Board's Tap targets to workaround Tap Bug

There's an onTap bug in Flutter (or Modroid)
https://github.com/flutter/flutter/issues/1497

I have to investigate further, but for now, we're going to workaround
it by mocking the center "Take" button with a styled Container.

Change-Id: I038121b62388a74384e2ff13cc6aaabb20f2d19d

vanadium/croupier,vanadium/croupier,vanadium/croupier