Fix combobox issue handling tab/enter custom value is allowed

[BDesta]

• Share logic so that tab/enter on combobx share same behaviour as when isFocused is false which is working as expected

Closes #2413

✅ Pull Request Checklist:

• [X] Included link to corresponding React Spectrum GitHub Issue.
• [x] 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:

🧢 Your Project:

Adobe