Removing/editing the ITUNESOWNER field doesn't work

[ohrenkino]

see e.g. here:

[X] metadata field "ITUNESOWNER" cannot be changed in 2.80

Hello, In v2.80 (current version) I noticed that if you try editing the metadata field "ITUNESOWNER" and save changes the value doesn't change at all. I've checked this using iTunes (song's information box) and the HEX editor and actually the values remain the same (it's not been overwritten). You can see this little bug by yourself trying to edit this metadata field of any .m4a iTunes file Anyway I love this tool, nice job!