Correct activity lifecycle when forcedResize activity is finished

- Regerssion introduced ag/1039265. We still need to resume the
starting activity in a task with an overlay activity is the starting
activity is the overlay activity. Otherwise the activity below it
might not be moved to the paused state.
- Also, we don't want to clear starting window for activities that
aren't behind fullscreen activities as we need to display their
starting window until they are done initializing.

Bug: 28808506
Bug: 28751186
Change-Id: I9a1a5feecea2ed3592a4064fca80e240a3bce387