INT-3336: Adjust implementation of remove from review

Author: kimwoodfield

src/test/ts/alien/Loader.tsx

@@ -72,9 +72,7 @@ export const render = async (props: Partial<IAllProps> = {}, container: HTMLElem
     root.render(<div><Editor ref={ref} apiKey='no-api-key' {...props} init={init} /></div>);
   });
 
-  const remove = () => {
-    root.unmount();
-  };
+  const remove = root.unmount.bind(root);
 
   return {
     ...ctx,