Make item size scale with stack size (#17623)

* Make stack count affect item size

* and the test, too

* readd this check

* vwoom

* huh

* if you ever read this commit message ping me on discord in #contributors

* changerinos

Content.Client/Stack/StackSystem.cs

@@ -38,9 +38,7 @@ namespace Content.Client.Stack
                 return;
             }
 
-            // Dirty the UI now that the stack count has changed.
-            if (component is StackComponent clientComp)
-                clientComp.UiUpdateNeeded = true;
+            component.UiUpdateNeeded = true;
         }
 
         private void OnAppearanceChange(EntityUid uid, StackComponent comp, ref AppearanceChangeEvent args)