[Notif redesign] Align actions in old media notif

This aligns the play/pause etc actions in the old-style media
notification with the rest of the content in most cases, given the new
larger "small" icon.

Bug: 378660052
Test: visual test, screenshot tests to come later
Flag: android.app.notifications_redesign_templates
Change-Id: I9582e490b82ce3e38c42ce898034a53def96b277