Show tag numbers in playlist editor

[RocketMan]

As a DJ entering a playlist in real time, I would like to see the zookeeper album tag numbers in the list of my recent spins.

I sometimes play multiple tracks from the same album, and in this way can easily reference the tag number again without having to go back to the physical media.

[Note, this is a regression, as the tag numbers were displayed in an earlier version of the playlist editor.]