Fix escape key to close IME in useOverlay

[ryo-manba]

Closes https://github.com/adobe/react-spectrum/issues/5921

✅ Pull Request Checklist:

• [x] Included link to corresponding React Spectrum GitHub Issue.
• [ ] Added/updated unit tests and storybook for this change (for new code or code which already has tests).
• [x] 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 OS keyboard settings
2. Add Chinese Pinyin - Simplified
3. Visit http://localhost:9003/?path=/story/dialog--form&providerSwitcher-express=false&strict=true
4. Type "ni", a set of suggestions should appear
5. Press Tab 3x
6. Press Escape and see the state of the dialog

🧢 Your Project: