SystemUI: Fix current formatting on lockscreen

* for devices that report directly in Ampere.

Shamelessly extracted from:
    base: Lockscreen Charging info (3/3) by: xyyx <xyyx@mail.ru>

original commit-message:

 base: Lockscreen Charging info (3/3)

 based on: [2/2] frameworks: show charging current & voltage on lockscreen by
 yank555-lu [2/2]Base: show more battery info on lockscreen when charging by
 yank555-lu LockscreenCharging: Use double for mChargingVoltage and show as
 4.XV by xyyx Lockscreen charging: Formatting improvements by nathanchance

AICPfy:
- default set to false
- Current formatting improvement for devices reporting directly in Amps

Change-Id: I24c8997128fecc22dbaf4990ede03ee99b6de3c7
1 file changed