Change show PlatformButtons apply height restrictions

This is how the original material components do it. Settings min height
allows buttons to grow to accomodate the scaled text.

Flag: EXEMPT bugfix
Fixes: 358004012
Test: manual on the foldable
Test: atest VolumePanelScreenshotTest
Change-Id: Iddff6d70e659b6150030704e14d314ef88d6e5bc