Respect buffer rotation in OutputLayer's filtering test

Otherwise GPU composition quality is degraded for:
* Non-prerotated layers
* Screenshots captured from devices with rotated panels

The second issue in particular is problematic for CTS.

Bug: 283075427
Test: SurfaceViewTests with a 90 degree panel installation
Test: libcompositionengine_test
Change-Id: I6dd7f0f385d7df0463a560d97c1ca5ee89998405