Show Task Surface if it will not be organized

When trying to start an Activity in a new Task in an organzied
TaskFragment, the Task is first created in TaskDisplayArea as a root
Task, and then got reparented to the TaskFragment. As a result,
Task#showSurfaceOnCreation() will return false, and there will not be
other call to show its surface.

Now, we show the Task surface if it can no longer be organized.

Fix: 193681081
Test: manually test following the reproduce steps with sample app
Change-Id: Ie3da5f1c789d25bcb828b3f1191867a346a508e8