Apply pending-intent op before blanket locktask check

PendingIntent goes through ActivityStarter which will, itself,
check locktask state. So, we can consider it one of the HOPs
that is valid to attempt during locktask-mode.

Bug: 283011244
Test: enable HOME/OVERVIEW features in lock-task policy,
      enter lock-task mode, go to home or recents.
Change-Id: Id209684db35b24ae12c4ec2f8c63ebebae1c0f9b