Fix: `Node Solo` (Shift + Click Eye) Can No Longer Accidently Nuke 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 remove all previous (before solo) 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.