Launching notification settings correctly inline

Previously, the panel would still collapse when launching
the notification settings. We're now looking at the
newly returned result of the activity launch instead to
determine if we should collapse.

Bug: 69168591
Test: launch settings activity from notification guts, observe no collapsing
Change-Id: I414e7f4a9fd22d4f0b46437bfdb94e5c0f6cce58