setings: Fix livedisplay settings

 * Since moving this to internal settings vs. kernel settings, the
   parameters were wrong and changes set via settings weren't being
   applied. Fixit.

Change-Id: I0676f6069729878b644914abe0ad0bca8a053c9e

livedisplay: Add an "off" state

 * Don't force "day" to be the default state.
 * Change minimum value for color calibration to 20% so blackout doesn't
   happen when all sliders are at minimum.
 * Also improve a few strings to describe what day and night means.

Change-Id: Ib2a617488fffb128c8e3e9e52d64fac6b261e53d

livedisplay: Fix for multiuser

Change-Id: If0ef1da91cf5310308abf08806f7902e25080d2c