Update App Header buttons background/ripple to spec

Changes the background drawable of the app chip and the maximize and
close buttons in the app header to meet these requirements:
1. The clickable/hoverable bounds of the buttons must be as large as
   possible (40dp height - equal to the header height, 44dp width for
   the maximize/close buttons).
2. The visible background ripple drawable should be 32x32dp, which means
   the ripple must be inset since the view bounds are larger than that.
3. The ripple drawable color & opacity is updated to spec, for both
   hover and pressed states.
4. The maximize button ripple & progress bar are now the same size
   (32dp) and have updated colors / opacity.

Bug: 342266301
Test: hover/press on app chip, maximize, close buttons, check ripple
bounds are rounded and have a 2dp margin between itself and the header
edges and other buttons. Also check maximize button's progress bar is
exactly at the edge of the ripple.

Change-Id: I8340761541cdc9f0bdbf424579d5db7b256ed261