fix: fix compare rel attribute

[hagushorn]

Description

i think it is a typo. Links will duplicate with attr.ref :)

Related Issue

https://github.com/module-federation/core/pull/2580

Types of changes

• [ ] Docs change / refactoring / dependency upgrade
• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)

Checklist

• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.
• [ ] I have updated the documentation.