[DocsUI M3] Update the padding for filter bar container

Chip in Material component has 48dp height by default because it
is the minimum touch target size, but the chip content only has
32dp, to cater this additional 12dp difference, we need to shrink
the vertical padding of the filter bar container.

Note: this CL also removes the vertical padding override in 600dp
and 900dp, because all sizes have the same value.

Bug: 383204418
Test: Manually inspect after deployment
Flag: com.android.documentsui.flags.use_material3
Change-Id: Id4ce5fb291d1090c63946e092b5def27ed9cfbd9