Avoid showing "0 minute" in the charge time label

Remove the charge to full time label if its value is invalid
https://screenshot.googleplex.com/5psbvFpcm2CFdRB

Test: make test RunSettingsRoboTests ROBOTEST_FILTER=com.android.settings.fuelgauge.*
Fix: 278740808
Change-Id: I765cdcdee8525adb2583d5950bc646c604c744de
1 file changed