Fix view jumping up in the password disappear...

animation. The problem is that the edittext is not statically anchored
to the bottom, so when we start the disappear animation, the height of
the view increases to basically the full vertical size of the screen,
causing the jump.

The solution here is to prevent the bottom padding to be set in
onApplyWindowInsets. This means the viewfliper view will remain the same
size for the duration of the disapper animation and we use a y
translation animation and apply it to the security container for a
smooth transition.

Fixes: 268221346
Test: start disappear animation in password. Switch security method to
see that those work as well.
Test: Test animation with bouncer user switcher as well.

Change-Id: Id036bb10df79e4d357c00265507b43632d763a6b