Consistent gap throughout and increased opacity after progress.

Flag: android.app.api_rich_ongoing
Fix: 383562384
Fix: 383557351
Test: Post ProgressStyle notifs via test app
Test: patch ag/30006048 and run ProgressStyleNotificationScreenshotTest
Change-Id: I048d0eb8770a1e13c3552d7effaa61d09b567d70