Drop redundant display of album artist in track lists

See e.g. https://open.audio/library/albums/5875/ for an example affected by this change.

This is a partial revert of the frontend changes in 1458c084.

Reasons not displaying the album artist in the track list is preferrable:

• The album artist is already printed at the top (Album containing N tracks, by Album Artist), so printing it in the track list is redundant
• For collaboration tracks (X feat. Y), the displayed Artist entry will contain the album artist twice (e.g. "X / X feat. Y")
• Printing only the track artists is consistent with the way songs are displayed in the playback queue

This Merge Request includes:

• Tests (N/A)
• A changelog fragment (N/A)