Dialer: Match dialer preference style across activities

- Change IMS Editor style to light
- Match order of save/discard buttons in SIP & IMS Editor
- Apply action bar background color to split action bar
  and change text/divider color to match
- Fix padding of IMS & SIP preference lists
- Switch non-editable preferences to disabled
  rather than not selectable to maintain list
  view divider and inform the user they cannot
  actually change it.

Change-Id: Ib48445e41d4678ce6f6e964729040efe8e67ec51