use comma when joining artists

scrobble/lastfm/scrobbler.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"net/url"
 	"strconv"
+	"strings"
 	"time"
 
 	"github.com/google/uuid"
@@ -57,7 +58,7 @@ func (s *Scrobbler) Scrobble(user *db.User, track *db.Track, stamp time.Time, su
 	params.Add("track", track.TagTitle)
 	params.Add("trackNumber", strconv.Itoa(track.TagTrackNumber))
 	params.Add("album", track.Album.TagTitle)
-	params.Add("albumArtist", track.Album.ArtistsString())
+	params.Add("albumArtist", strings.Join(track.Album.ArtistsStrings(), ", "))
 	params.Add("duration", strconv.Itoa(track.Length))
 
 	// make sure we provide a valid uuid, since some users may have an incorrect mbid in their tags