Visualizer systems update (#8203)

* optimize appearance updating for subfloor entities

* sprite event args

* a

* stop double appearance update.

Content.Shared/SubFloor/SharedSubFloorHideSystem.cs

@@ -63,9 +63,6 @@ namespace Content.Shared.SubFloor
                 var xform = Transform(uid);
                 _trayScannerSystem.OnSubfloorAnchored(uid, component, xform);
                 UpdateFloorCover(uid, component, xform);
-
-                if (component.IsUnderCover)
-                    UpdateAppearance(uid, component);
             }
             else if (component.IsUnderCover)
             {