HMI AR thumbnail don't showing properly on the mobile devices

[dpshelio]

Originally reported by: David PS (Bitbucket: dvdgc, GitHub: Unknown)

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Though this could seem an issue for the mobile site, I believe it's to do with the size of the image, and therefore the thumbnail processing.

An example of the effect is shown in this screenshot.

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• Bitbucket: https://bitbucket.org/solarmonitor/solarmonitoridl/issue/34