[DocsUI M3] Update styles for nav item action icon

Replace the <FrameLayout> + <ImageView> to <MaterialButton> for
the action icon inside the nav item row.

Check the demo video in the bug.

Bug: 383183442
Test: Manually inspect after deployment
Flag: com.android.documentsui.flags.use_material3
Change-Id: Ic85a67b9a4ef67020f263ef6b57c8ddec5926314