[SurfaceFlinger] Fix screenshot orientation in landscape

Change I0f7db422399985a1ff17da3faa946ff0943e58f7 defined a reverse
mapping for use by screenshots, e.g. a 90 degree rotation would be
passed down to SurfaceFlinger as 270 degrees. Change
I644bff547bed7d24284b8a6e7899a567d1f4cddf accidentally removed this
mapping, so adding it back into SurfaceFlinger.

Bug: 133849373
Test: adb screencap when phone is in landscape
Change-Id: I9d12551587307fa9f8028e78649545064051b46e