Remove useIdentityTransform from DisplayCaptureArgs.

Screenshots do not set useIdentityTransfrom to true with
a rotated display. The default value is false in
SurfaceFlinger and is not relevant for captureLayers,
which is the API that will be used for screenshots going
forward.

Bug: 293445881
Test: presubmit
Change-Id: I57ad5addcc8209b1f2f2b25b475bf11040c4327d