r13 converter: flac to flac truncated lyrics tag

[Teknojnky]

I found some flacs I had not converted to 1.21 yet, when I converted them flac to flac overwriting the original, the lyrics tag was truncated at the first line.

I noticed it because of the pop up details had included the lyrics (making a huge pop up) and after conversion, the pop up was alot smaller.

I added the lyrics back no problem, just figured I would note it to be looked at.