Fix auras taking effect in building previews

Auras.CanApply called Visibility's GetPreview(), which doesn't exist,
so auras were applying in preview. Introduced in eb2ff98883.

Add GetPreview() to Visibility.

Fixes #9225

binaries/data/mods/public/simulation/components/Auras.js

@@ -156,7 +156,7 @@ Auras.prototype.CanApply = function(name)
 {
 	// Check if this is a preview entity
 	const cmpVisibility = Engine.QueryInterface(this.entity, IID_Visibility);
-	if (cmpVisibility && cmpVisibility.GetPreview && cmpVisibility.GetPreview())
+	if (cmpVisibility?.GetPreview())
 		return false;
 
 	return this.AreTechnologyRequirementsMet(name);

binaries/data/mods/public/simulation/components/Visibility.js

@@ -94,4 +94,9 @@ Visibility.prototype.GetAlwaysVisible = function()
 	return this.alwaysVisible;
 };
 
+Visibility.prototype.GetPreview = function()
+{
+	return this.preview;
+};
+
 Engine.RegisterComponentType(IID_Visibility, "Visibility", Visibility);