v1 docker proxy assets 404 on download click

While testing the docker branch, I noticed that assets from the docker proxy labelled v1 were 404ing on download. v2 assets were ok.
Kelly Robinson noted that the URL contained an extra /v1/images. Removing it caused the download to work. I am leaving major because the workaround is not intuitive.
See vid.
This is regression from m5 where this works.

You can (currently) get v1 assets by pulling hello-world or ubuntu. You can (currently) get v2 assets by pulling baselibrary/ubuntu.

Docker is not in NX2 so this does that affect that.