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

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



Change-Id: Ifd9c932a870117e278c59af45c6a57132831de5f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>