google_battery: take ttf ratio into report condition

To prevent showing unexpected time to full, take ttf ratio into
report condition. Stop showing TTF if max ratio over 300

Bug: 202914676
Signed-off-by: Jenny Ho <hsiufangho@google.com>
Change-Id: Iade9f9209b3e223872a5943423e2d59c4c8f310d