Fix b/257404630 Inconsistent strings in battery chart

Change all the "from last full charge" to "since last full charge".

Bug: 257404630
Fix: 257404630
Test: presubmit
Change-Id: Ib316e9fecac60f388e2b1810de9a65c540c52358
Merged-In: Ib316e9fecac60f388e2b1810de9a65c540c52358
3 files changed