Move the gray color option to front am: f355b44186

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

Change-Id: I2028dffa3ba7dd0a125b58ff00719578ff0a155c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>