Add correct scope for Members::MemberApproval

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/167319



Merged-by: Jason Goodman <jgoodman@gitlab.com>
Approved-by: Bishwa Hang Rai <bhrai@gitlab.com>
Approved-by: Jason Goodman <jgoodman@gitlab.com>
Reviewed-by: Bishwa Hang Rai <bhrai@gitlab.com>
Co-authored-by: Suraj Tripathi <stripathi@gitlab.com>