Remove duplicate setting of variable

Fix
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/12198#note_37145640

app/assets/javascripts/repo/helpers/repo_helper.js

@@ -180,7 +180,6 @@ const RepoHelper = {
   setFile(data, file) {
     const newFile = data;
 
-    newFile.url = file.url || location.pathname;
     newFile.url = file.url;
     if (newFile.render_error === 'too_large' || newFile.render_error === 'collapsed') {
       newFile.tooLarge = true;