Fix broken Members link when relative URL root paths are used
EE port of gitlab-org/gitlab-ce!15070
Navigating to the "Members" section of a project would omit the relative URL root path. Fix the redirection and eliminate the need for a redirection in the first place.
Related Rails issue discussing omitting the leading slash in the redirect paths: https://github.com/rails/rails/issues/21193
Edited by Stan Hu