Frameworks: add reset option to clock color and cleanup (2/2)

to be consistent. So we have now on all places with colorpicker
same logic + option per menu to reset color to default.

as well some cleanup and codestyle corrections

cheers

Change-Id: Ife006425ee769feb438497d6483f520c7b1f236e

Conflicts:

	packages/SystemUI/src/com/android/systemui/statusbar/policy/BatteryBar.java
	packages/SystemUI/src/com/android/systemui/statusbar/policy/Clock.java