Blender Git Loki

Update the default Face Set when creating Face Sets from visible

If all vertices in the sculpt are visible create the new face set and
update the default face set. This is the same as disabling the overlay,
so it will not have the extra performance cost of rendering a colored
face set twice that gives no information.

Reviewed By: jbakker

Differential Revision: https://developer.blender.org/D7530