Fix CC license button images on webpage

[victoriaheath]

I was notified by a user that the CC license button images on this page are not appearing.

https://creativecommons.org/choose/results-one?license_code=by-sa&jurisdiction=igo&version=3.0&lang=en

[TimidRobot]

Broken Images

The broken image URLs are:

• https://i.creativecommons.org/l/by-sa/3.0/igo/88x31.png
• https://i.creativecommons.org/l/by-sa/3.0/igo/80x15.png

Additional Context

• The i.creativecommons.org domain redirects to licensebuttons.net.
• The icons are stored/managed in the creativecommons/licensebuttons repository