Increase item preview loading UI delay back to 500ms

I don't remember why we set it to 200ms before, but it feels too aggressive now. Idk!

src/app/ItemPage.js

@@ -662,7 +662,6 @@ function ItemPageOutfitPreview({ itemId }) {
     wornItemIds: [itemId],
     isLoading: loadingGQL || loadingValids,
     spinnerVariant: "corner",
-    loadingDelayMs: 200,
     engine: "canvas",
     onChangeHasAnimations: setHasAnimations,
   });