Correctly throw Spline errors

[marcofugaro]

Close #49

Now you can catch Spline errors with ErrorBoundary correctly.

import { ErrorBoundary } from "react-error-boundary";

<ErrorBoundary fallback={<div>Something went wrong</div>}>
  <Spline scene="https://prod.spline.design/6Wq1Q7YGyM-iab9i/scene.splinecode" />
</ErrorBoundary>