`Upload#url` is more likely and can change from time to time. When it
does changes, we don't want to have to look through multiple tables to
ensure that the URLs are all up to date. Instead, we simply associate
uploads properly to `UserProfile` so that it does not have to replicate
the URLs in the table.
This is a regression as a result of 7896c74c2b. Most instances would have ran the migrations and some might have run this migration with the incorrect query. Impact of this is small for now but I'm fixing this for correctness purposes.