fix(#4067): Storybook Provider addon: Express input:checkbox requires id to be labelled by htmlFor prop

[majornista]

react-spectrum/.storybook/custom-addons/provider/register.js

Lines 113 to 114 in e9f0817

	<label htmlFor="express">Express: </label>
	<input type="checkbox" name="express" onChange={onExpressChange} checked={values.express} />

should be

 <label htmlFor="express">Express: </label>
 <input type="checkbox" id="express" name="express" onChange={onExpressChange} checked={values.express} />

Closes #4067

✅ Pull Request Checklist:

• Included link to corresponding React Spectrum GitHub Issue 4067.
• Added/updated unit tests and storybook for this change (for new code or code which already has tests).
• Filled out test instructions.
• Updated documentation (if it already exists for this component).
• Looked at the Accessibility Practices for this feature - Aria Practices

📝 Test Instructions:

1. Open Storybook
2. Mouse click on the "Express:" label or the "express" checkbox input in the Provider settings toolbar above the story.

3. Mouse clicking the `label` should toggle the checkbox when the label is properly associated with the input using `htmlFor` and a proper IDREF.

🧢 Your Project:

Adobe/Accessibility

[rspbot]

Build successful! 🎉

• View the storybook
• View the storybook-17
• View the storybook-16
• View the documentation

[rspbot]

## API Changes

unknown top level export { type: 'identifier', name: 'Column' }
unknown top level export { type: 'identifier', name: 'Column' }
unknown type { type: 'link' }
unknown type { type: 'link' }
unknown type { type: 'link' }
unknown type { type: 'link' }
unknown type { type: 'link' }
unknown type { type: 'link' }