The digital versions weren’t the “unaltered” versions so they had no real obligation to include the Fox logo and fanfare. If they were going to market an “unaltered” version, it wouldn’t technically be unaltered if it didn’t have it. Also, they would have to work out some kind of deal with Fox for the original at least anyway. I wouldn’t be surprised if Fox requested the logo be kept in all three and I don’t see why Disney would think it’s a big deal. Everyone knows Fox was the original distributor for Star Wars, there’s no hiding that history and it doesn’t change the fact that Disney owns it now.