Don't applyReady immediately when create empty TaskFragment

TaskFragmentOrganizer may create empty TaskFragment and wait for
activity to start in it. In this case, wait for activity launch
lifecycle event to set ready.

Bug: 318762281
Test: verify with settings on folded device
Change-Id: Ib982bd18c0a4e9812c5327b41c86fc0ea16cc35c
1 file changed