Settings: Change desc for battery charging text color

Append " (16-89%)" to name of setting description to more accurately
    describe what the setting is changing.
    (0-15% = red, 16-89% = custom color, 90-100% = green)

Change-Id: I1c53c3d280171cd484615db629368529d9b9d7a6
Settings: fixed battery stats app list

The check of mAppListGroup getPreferenceCount is no longer working
after we added other options on this page. Add a separate counter to get
back the full possible list of 12 apps

Change-Id: I679b01deec0f52d4fa2012a31b7b305f8fe176b5