[Notif] Reset falsing check for blocking helper

Currently, if you long press on the notif in lock screen and then are
interacting with the blocking helper UI (NotificationInfo), the content
automatically closes after 8 seconds even if you've hit stop/undo/etc.

Instead of letting this happen, reset the timeout.

Test: Manually that it doesn't timeout after 8s on LS after update
Bug: 110213459
Change-Id: I0169a7749b718714595bd7239375308f30bf4c43