lightbar: make tap red threshold match low battery threshold
lightbar: make tap red threshold match low battery threshold

Make tap for battery red threshold match the low battery red
threshold.

BUG=chrome-os-partner:36811
BRANCH=samus
TEST=use a fake battery console command to change battery percentage
on samus and make sure that the same level at which lightbar turns
red in S0 is the same level at which tap for battery shows red.

Change-Id: I084c8412beac4f5b311eb30f46f4f3273e9f2456
Signed-off-by: Alec Berg <1a4429eeda29095a12e19a73405f80f5b7f37a63@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/252521

thehobn/ec,thehobn/ec,thehobn/ec,thehobn/ec