Fix following three issues in SD Card UX

1) Link should not work if up-events happen outside the target region
2) Activity should retain it's last state on changing configuration
3) Improve color contrast for "Format card" button

Bug: 246485658
Bug: 246681292
Bug: 246871051

Change-Id: Iebc87e35a3f8496a33a43d906b7faba05d95fe6c