[flexiglass] Makes PIN buttons not squished.

They were squished on foldables in vertical layout directions (folded
and unfolded).

Fix: 309524544
Test: see before and after screenshots in attached bug and updates Scuba
goldens.
Flag: ACONFIG com.android.systemui.scene_container DEVELOPMENT

Change-Id: Ief188ec3c9bb344bc2f140f1d8701827c0943cd6