SystemUI: Fix battery indicator alignment

Before: http://i.imgur.com/WEz7pPa.png
After: http://i.imgur.com/BkvQ3Df.png

Change-Id: I7ed9f79863eeebd3dd2ba44ae95d413d4d5ebe9e
Call to equals() comparing different types (FindBugs)

Call to HashSet<PrintServiceInfo>.equals(ArrayList<PrintServiceInfo>).
The result of this comparison will always be false.

Change-Id: Ic8cc6eab99cea4c7b3841faf6bc84c246273e8d0