fix(nuxt-img): ensure loading comes before srcset

[danielroe]

🔗 Linked issue

❓ Type of change

• 🐞 Bug fix (a non-breaking change that fixes an issue)

📚 Description

[cloudflare-workers-and-pages]

Deploying nuxt-image with    Cloudflare Pages

Latest commit:	8cae1dd
Status:	✅  Deploy successful!
Preview URL:	https://24fd8384.nuxt-image.pages.dev
Branch Preview URL:	https://fix-srcset-lazy.nuxt-image.pages.dev

View logs

[pkg-pr-new]

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npm i https://pkg.pr.new/@nuxt/image@2066

commit: 8cae1dd

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 6.99%. Comparing base (22ba26b) to head (8cae1dd).

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #2066   +/-   ##
=====================================
  Coverage   6.99%   6.99%           
=====================================
  Files         78      78           
  Lines       3629    3629           
  Branches     140     140           
=====================================
  Hits         254     254           
  Misses      3326    3326           
  Partials      49      49           

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