Remove the timestamps of last day for battery level chart if last day has less...

Remove the timestamps of last day for battery level chart if last day has less than 2 hours data. am: 57cb7642 am: 28bdf84b

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Settings/+/20309948



Change-Id: I748c1247a96b3d4ae9160d76c768e2db7af2611a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>