[EE] Fix a failure because we stub DiffHelper#diff_file_blob_raw_path instead of #diff_file_blob_raw_url
requested to merge ee-41291-spec-failure-on-spec-features-merge_requests-image_diff_notes_spec-rb into master
EE MR for https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/16052.
What does this MR do?
Fix a failure because we stub DiffHelper#diff_file_blob_raw_path instead of #diff_file_blob_raw_url.
Edited by Rémy Coutable