Don't dim screenshots when there's no HDR on-screen. am: 93a128378e

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/24763138

Change-Id: I89ae03df82014378eb57523fb07286794542924f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>