Don't defer app transition if one of activity isn't one of recents.

By this way the app transition won't get stuck when start another
app by quickstep.

Bug: 265389263
Test: start recents animation and finish a top activity of a
participanted task immediately, verify the opening transition of next
activity won't happen right away.
Then open another app by quickstep, and verify the transition can take
place immediately.

Change-Id: I34205b70827af3d9e85617732b5ddc1bda88f839