Ensure owner of tracks/albums/artists can approve suggestions

Artists, tracks and albums are by default attributed to the first uploader. This attribution means that the person can edit the artist, track and album pages (title, tags, etc.).

However, the check for this specific case wasn't implemented in %0.19, meaning edits submitted by those persons weren't automatically approved. This fix the issue.

cc @funkwhale/reviewers-front @funkwhale/reviewers-python