fix(weserv): map rotate operation to ro

[DamianGlowala]

🔗 Linked issue

resolves #1408

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 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

Rotation operator should be mapped to ro instead of rot, as per docs.

[cloudflare-workers-and-pages]

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Latest commit:	dc2fe8d
Status:	✅  Deploy successful!
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Branch Preview URL:	https://fix-weserv-rotate.nuxt-image.pages.dev

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.26%. Comparing base (3104213) to head (dc2fe8d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1441   +/-   ##
=======================================
  Coverage   62.26%   62.26%           
=======================================
  Files          79       79           
  Lines        3599     3599           
  Branches      397      397           
=======================================
  Hits         2241     2241           
  Misses       1328     1328           
  Partials       30       30           

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