Battery Styles: Remove unneeded function parameter in BatteryMeterView

- Previously, we added a boolean parameter in the updateShowPercent
function that was used for the battery percentage in the quick status bar header.
With the new battery style code, this boolean is no longer needed.
Let's remove all the code that was affected by this change.

Change-Id: I29a1b894253a67812dcd8e4c0399a0ebe837ff8a
2 files changed