Fix: Node Solo Can No Longer Accidently Nuke Previous Visibility Settings

(Node Solo == Shift + Click on visibility icon...)

Previous Behavior: Shift clicking on a layer's visibility icon to 'solo'
it and then left clicking on another layer's visibility would completely
nuke previous visibility settings. This was very destructive!

New Behavior: If there's a solo active on any given node, a single left
click on any visibility icon will simply restore the original visibility
status for all nodes. This means that you will no longer break
visibility of your document.

(cherry pick from commit d8e564e6ae1a7c48ec4181aa1b18bf5ec1b213d9)