lazyload placeholders should have only the quality as a processing operator

[selul]

Right now when we build the eco placeholders urls, the width and height is still present which might causing duplicate images using different urls i.e
/w:100/h:100/q:eco/https://example.com/image.png
/w:120/h:200/q:eco/https://example.com/image.png

Both of them serve the same image but uses a different url.

We can avoid this by generating the placeholder URL without the width/height, i.e

/q:eco/https://example.com/image.png

[selul]

🎉 This issue has been resolved in version 2.1.0 🎉

The release is available on GitHub release

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