Fix notification launch animation for split shade

The launchAnimationParams contain global coordinates. These need to be translated to local coordinates, since the NotificationStackScrollLayout does not have its origin at (0,0) in the split shade case.

Test: Manual, i.e. posting various types of notifications and analyzing the animations in screenrecordings.
Bug: 246932690
Change-Id: I9dd233d282d05fc25b3601180c775916ddb5197c