BUG #14557: Fixed updating on Color Map editor.

+ Renamed button as "Render Views" instead of "Update" to make it
clearer what the button does.
+ Changed default to auto-update/auto-render all the view when LUT is
changed.
+ Also added icon for Save as default to make the UI consistent with
Properties panel.

Change-Id: Ia69c6087de5c912cce8e21c422e309aa8bf1d031
Merge topic '14557-color-legend-update' into next

2159eb3f BUG #14557: Fixed updating on Color Map editor.