Correct used size of Storage Settings. am: e52320e7 am: 88659e80

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Settings/+/23483884



Change-Id: I34a0e0084c28c0c575ab0081e53e81e8a18f9b8a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>