go back to wikipedia because it works both inside and outside the storybook iframe

Author: LFDanLu

packages/@react-spectrum/dialog/stories/Dialog.stories.tsx

@@ -171,7 +171,7 @@ function renderIframe({width = 'auto', isDismissable = undefined, ...props}) {
             <Header>The Header</Header>
             <Divider />
             <Content>
-              <iframe width="100%" title="textfield iframe" src="iframe.html?providerSwitcher-express=false&providerSwitcher-toastPosition=bottom&viewMode=story&id=textfield--default" />
+              <iframe width="100%" title="wikipedia" src="https://wikipedia.org/wiki/Main_Page" />
             </Content>
             {!isDismissable &&
               <ButtonGroup>