Consistent portrait/landscape spacing

as temporary workaround for VirtualDisplay orientation change leaking
into SystemUI

Fixes: 148247663
Bug: 148675523
Test: manual - click into overflow, click bubble - no spacing change
Test: manual - expanded bubbles - rotate phone to landscape - no spacing change, bubbles left aligned
Change-Id: Ib17d84f5044cf6e4c8111385560bfc533fcad303