Styling changes for ClearAllButton

- The new style is a Widget.DeviceDefault.Button with tweaked corner radius, min size and color
- Light: http://screen/4aTR7DKuhADn2Z6
- Dark: http://screen/68XkvaAqRivbDw8

Bug: 194194694
Bug: 197887431
Test: manual
Change-Id: I1e0f2217a424a244d729c1f952035615ba045d5a
3 files changed