livedisplay: Add "off" state and fix issues with QS tile

 * It was previously assumed that "day" was the default setting that
   would be used the same as "off" would, but this is confusing and
   also doesn't allow for a custom day temperature.
 * Add a new state for "off" to simplify this, and handle it
   appropriately. We won't show "day" in the QS tile if both "off" and
   "day" are set to 6500K.
 * Also fix bugs in the QS tile.

Change-Id: Ie8e6ebdd83c9275fb7707844b8f054dcbff48a0b