fix: device_model and device_name properties were inverted

[marandaneto]

💡 Motivation and Context

They now match the taxonomy https://github.com/PostHog/posthog/edit/master/frontend/src/lib/taxonomy.tsx

💚 How did you test it?

fix: device_model and device_name properties were inverted

📝 Checklist

• I reviewed the submitted code.
• I added tests to verify the changes.
• I updated the docs if needed.
• No breaking change or entry added to the changelog.