Move the gray color option to front am: f355b44186 am: e81a259ef6

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/ThemePicker/+/22631578

Change-Id: I9fc4398c56cd110fadf99670ab3e72934c09c904
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>