fix: UserEvent tab retargeting bug

[snowystinger]

Found while working on another PR

Addresses testing-library/user-event#1188 while we wait to see if my PR is accepted or another is suggested

Note, the tests changed here I believe were wrong to begin with, this is now correct and matches the browser behaviour.

There are no source changes here

✅ 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:

[rspbot]

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[LFDanLu]

the test changes make sense, kinda odd that their tab handling didn't use document.activeElement to start with but hopefully they chime in on the PR if there was a good reason for it