Fix the jumpcut surface position

Before, we always position the surface to its relative position to the
root leash. This should only happen if the surface has been reparented
to the root leash.

For example, when a TaskFragment is animated with in a resizing freeform
Task, its surface parent is the Task surface. The position of its
surface should be related to the Task surface instead.

Bug: 375618171
Flag: EXEMPT bug fix
Test: verify with 2D AE demo app on emulator
Change-Id: I6a77fd65da134c2b898d8502640d7ab0b87bb995