Only apply crop to task and task fragment in end transition

If asTaskFragment() is null, the window container can be
DisplayContent, DisplayArea, WindowToken, ActivityRecord.
Because DisplayArea and WindowToken rely on DisplayContent,
while ActivityRecord relies on task, only the parent container
of activity needs the crop.

Otherwise such as WallpaperWindowToken may be cropped unexpectedly
if it has a rotation transform.

Fix: 261704203
Test: Enable shell transition.
      Launch landscape app and back to portrait home.
      Wallpaper should not be half black.
Change-Id: Id262090c64814370e3f215acdf670d7b4d6ee1e9