fb: add Battery Styles the new way 1/2

As usual color options are present for the User to style the icon

Mr. Apocalypse:
This undos the AOKP's way of doing this, since for some reason it didn't
change colors with a theme. This way, it'll change colors with the theme
and the user can change colors and styles from Settings. All creditz to
Slim & AICP.

Change-Id: I904452aaa84116295590a076ef9e9865c5aeeaae