Go-to-def on GitHub appends absolute URL

Created by: attfarhan

• Browser extension version: v20.4.21.1107, on Chrome

Steps to reproduce:

1. Go to https://github.com/sourcegraph/sourcegraph/pull/10286/files#diff-b8b9fb9fa11b884295cef9ca61b7eed4R124.
2. Hover over suggestions. Click go to definition.
3. Notice it takes you to https://github.com/sourcegraph/sourcegraph/compare/https:/github.com/sourcegraph/sourcegraph/blob/b5637591d3ca88cbbb8fc4192a3440875a78414a/shared/src/search/parser/completion.ts?expand=1#diff-b8b9fb9fa11b884295cef9ca61b7eed4R124

Expected behavior:

You get taken to https://github.com/sourcegraph/sourcegraph/blob/b5637591d3ca88cbbb8fc4192a3440875a78414a/shared/src/search/parser/completion.ts?expand=1#diff-b8b9fb9fa11b884295cef9ca61b7eed4R124

Actual behavior:

The absolute URL is appended to github.com/sourcegraph/sourcegraph/compare