Update logic for shifting points outside of drawable bounds.

Also removed `format="dimension"` for the
NotificationProgressDrawableSegments.minWidth attribute, since it was
already included in a pre-existing attribute.

Flag: android.app.api_rich_ongoing
Bug: 372908709
Fix: 383566179
Test: NotificationProgressBarTest
Test: Post ProgressStyle notifs via test app
Change-Id: Ie4cf2992837f4169939281f5b4e139d7e61a4b96