camera2: follow new 4.4 UI guidelines

powershot button was still ICS blue...changed to white

Change-Id: Ic4c813de047a5bd84ed1bb3b124fa2b7d0ca064d
White panorama ui

white progress indicator
white recording shutter button

Change-Id: I8c2eddc6059ae19a2c98cf928b51bab4c05c9232