app-next: fix test

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

packages/app-next/src/App.test.tsx

@@ -16,7 +16,6 @@
 
 import React from 'react';
 import { renderWithEffects } from '@backstage/test-utils';
-import App from './App';
 
 describe('App', () => {
   it('should render', async () => {
@@ -42,6 +41,7 @@ describe('App', () => {
       ] as any,
     };
 
+    const { default: App } = await import('./App');
     const rendered = await renderWithEffects(<App />);
     expect(rendered.baseElement).toBeInTheDocument();
   });