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Adding recents to stopping if the preload success
The recents activity could be removed from the hierarchy if the preload was failed. And the activity will be leaked in the stopping list since it was added to the list in the end of the preload process. Bug: 322752270 Test: wm presubmit Change-Id: Id963c2e8d1c3d87e4c6c09c1debe0be335077fb9