Only defer remove starting window if the collecting target below task

Recents transition only collect the task, so the defer remove condition
cannot check TransitionController#inCollectingTransition since that
would check all of it's parent. And ActivityRecord cannot receive
onSyncTransactionCommitted when the target is task only.

Bug: 301278884
Test: try to simulate start recenst + app window draw at the same time,
monitor the starting window can remove normally.

Change-Id: Ia4b1c654679e07c2dd59b97348d78a3b6df1113d