Common image uploads sizes cropped

[zogstrip (Régis Hanol)]

I noticed this earlier today and just pushed a fix

https://github.com/discourse/discourse/commit/ebd4b4577168644ff1132af85215bfa2034ecdbb

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@DeanMarkTaylor

Additional notes

Please also consider adding a visual indicator on the smaller image when it has been cropped.

I’m open for suggestions