Remove useless optimization mode backup for FULL_POWER_LIST am: 2c125d29 am: 7a343c34

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Settings/+/23240822



Change-Id: I08b645a313768575c2758bfa8840fd984fe49d1a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>