Fix live notes refresh in relative URL deployments
What does this MR do?
This MR fixes URLs used for refreshing notes--the relative_url prefix was appended twice
Why was this MR needed?
In case of relative_url
installation, opening a page which does refresh notes (i.e. merge request), the page generates lots of 404 errors in the browser console. It turns out that the relative_url is prepended to the link twice.
Supersedes !233 (closed)