[DocsUI M3] Fixed the move issue for filter chips

After moving the filter chips padding from the container to the
chip group, we need to update the code to use padding start as
it's moving origin.

Check the fixed demo in the bug.

Bug: 384574562
Test: Manual inpsection, click/tap the filter chips
Flag: com.android.documentsui.flags.use_material3
Change-Id: I34151e53f5bd4ac10dfdec3d4567b50cb5167cf1