x/vuln: GetByModule for a local source client breaks standard library pages on pkgsite

[jamalc]

What did you do?

Ran golang.org/x/pkgsite/cmd/pkgsite with `GO_DISCOVERY_VULN_DB="file://<vulndb_mock>"

What did you expect to see?

No errors on standard library pages.

What did you see instead?

[zpavlinovic]

I believe GetByModule is obsolete now. Is this issue still present?

[zpavlinovic]

The issue seems to be gone. The pkgsite has its own vuln db client that handles this well now.