DO NOT MERGE Fix BAL via notification.publicVersion

We stripped the token that allows app to retrieve their own notification
and fire their own PI to launch activities from background. But we
forgot to strip the token from notification.publicVersion

Bug: 278558814
Test: NotificationManagerTest#testActivityStartFromRetrievedNotification_isBlocked
Change-Id: I8f25d7a5e47890a0496af023149717e1df482f98
(cherry picked from commit cf851d81)