Revert "[Notif] Disable "Customize" for blocking helper"

This reverts commit 3cfc9507.

Reason for revert:
Apparently a breakage got through treehugger - I hadn't synced my changes and one of the params was incorrect. Reverting for now and rebasing before resubmit...

Bug: 77321231
Change-Id: Ib306759d6344a69f17331a6c3c9cc78d1345508b