Change battery usage dropdown list item texts from "Breakdown by ..." to "By ..."

mock: https://screenshot.googleplex.com/C8ZbSL6UfJ9jRJx.png
screenshot: https://screenshot.googleplex.com/4nqRv3UA2iGoQuK.png

Bug: 278986376
Fix: 278986376
Test: manual
Change-Id: Iccb67c3695b21b62d5d26a96a791ca46a1ba7e0a
2 files changed