systemui: Add text plain battery style (updates)

merge in some leftovers, but keep the textstyle how it is

Change-Id: I11427224d95b5eac6ab5ff6553a085efcbef7d3c
fb: update missing google UI changes for 4.4

thanks to kroz other things are now as well consistent to the new
google UI style

Change-Id: Iac785dd5faaf2f1344a833f1a16fbffe9cab86d1