Link the approved sticker to the CodeApprove review rather than the image

[mtlynch]

Minor thing, but it's bitten me a few times:

The "Approved" stamp is a link, but it just links to a larger version of the same image, which users probably never want. It would be good to link it instead to the CodeApprove review.

[samatcodeapprove]

@mtlynch 🤦 well this seems obvious in hindsight! Will do.

[samatcodeapprove]

Fixed!

[mtlynch]

Confirmed, thanks!