[Bouncer] Fix some responsiveness issues.

Found a couple of responsive issues and fixing them.

1. Numpad key digits had a min size of 32 sp. This would look off when
   we maximize the display size and go into half folded on a foldable
   device. I set the text to autosize with a max size of 32sp.
2. Userswitcher anchor was squished in password security method on
   tablet. I removed some clipping in order to fix this.

Fixes: 261062809
Test: Open password view with max display and normal display sizes for
tablet.
Test: Half fold on foldable for pin view in bouncer.

Change-Id: I78fbbb231c35118bef65660b7ca5562d77dad16b