Fixes testResumedWhenRecreatedFromInNonFocusedStack

If the activity is in stopping or stopped state, for instance, it's in
split screen task and not the top one, the last configuration it should
keep is the one before multi-window mode change.

Bug: 155691588
Test: atest --iteration 5 ActivityLifecycleSplitScreenTests
Change-Id: I95e469798fe67ff75abef33b5e515a09c7e4731c