Remove last edited date from FileMixin

app/converters/sandpaper.py

@@ -54,7 +54,6 @@ def convert_corpus(json_corpus, user, corpus_dir):
         user=user,
         creation_date=datetime.fromtimestamp(json_corpus['creation_date']),
         description=json_corpus['description'],
-        last_edited_date=datetime.fromtimestamp(json_corpus['last_edited_date']),
         title=json_corpus['title']
     )
     db.session.add(corpus)