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
(cherry picked from commit cf851d81)
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:1896c2e7068c9ec1ab8355d863d7e8107d5d5706)
Merged-In: I8f25d7a5e47890a0496af023149717e1df482f98
Change-Id: I8f25d7a5e47890a0496af023149717e1df482f98