Fix issue #258640: Automatic propagation of FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET

Make sure, if an activity is started with clear task when reset, if that
activity is finished in the middle of a stack that the behavior is retained
by propagating it to the next activity.

Change-Id: Ie31b8f968558b0e64e0ef7efa55950a722c6afa5