Fix: Battery Status Icons

    - Dim circle battery icon on opaque status bars (reflect stock behavior)
    - Reduce size of circle battery
    - Reset battery bar text color when it crosses the 50% threshhold

Patch Set 1: Initial Commit
Patch Set 2: Remove pa_colors

Change-Id: If182ee6e3c5f10a8b9354ae77094fb659108454a

Conflicts:
	packages/SystemUI/res/values/snacks_colors.xml