platform_FullyChargedPowerState: fix key error

This fixes the string key value when looking up power information in the
dictionary supplied by get_power_supply_info.

BUG=chromium:519038
TEST=watch test run in lab

Change-Id: Ibc1eebe2a6ef6b6731503aee7e7cb61035a86457
Reviewed-on: https://chromium-review.googlesource.com/312997
Commit-Ready: Derek Basehore <dbasehore@chromium.org>
Tested-by: Derek Basehore <dbasehore@chromium.org>
Reviewed-by: David Hendricks <dhendrix@chromium.org>
Reviewed-by: Eric Caruso <ejcaruso@chromium.org>
Reviewed-by: Todd Broch <tbroch@chromium.org>
1 file changed