fix(i18n): broken dedupe of loc and alternatives

[harlan-zw]

🔗 Linked issue

https://github.com/nuxt-modules/sitemap/issues/333

❓ Type of change

• [ ] 📖 Documentation (updates to the documentation or readme)
• [x] 🐞 Bug fix (a non-breaking change that fixes an issue)
• [ ] 👌 Enhancement (improving an existing functionality)
• [ ] ✨ New feature (a non-breaking change that adds functionality)
• [ ] 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• [ ] ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

URLs are not being deduped properly when we have i18n enabled.

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Name	Status	Preview	Updated (UTC)
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