fix: ensure that class names produced by S2 style macro differs for each theme

[bhovhannes]

Closes

✅ Pull Request Checklist:

• 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).
• 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:

[bhovhannes]

chc here is the hash of 0.6.0 read from package.json. I pushed this test just to illustrate how my changes affect produced CSS.