Refactored
Fixed - task 427: [feature] optimise use of root for dumpsys calls if
DUMP perm is available (system app) 
https://github.com/asksven/BetterBatteryStats/issues/issue/427
Fixed - task 427: [feature] optimise use of root for dumpsys calls if
DUMP perm is available (system app) 
https://github.com/asksven/BetterBatteryStats/issues/issue/427
refactored