service/mpris!: convert trackArtists from list<string> to string

Most people treat it as a string already, which breaks in Qt 6.8,
and I have not seen a meaningful multi-artist response.

Author: outfoxxed

src/services/mpris/player.cpp

@@ -301,7 +301,7 @@ void MprisPlayer::onMetadataChanged() {
 	auto trackTitleChanged = this->setTrackTitle(trackTitle.isNull() ? "Unknown Track" : trackTitle);
 
 	auto trackArtists = this->pMetadata.get().value("xesam:artist").value<QVector<QString>>();
-	auto trackArtistsChanged = this->setTrackArtists(trackArtists);
+	auto trackArtistsChanged = this->setTrackArtists(trackArtists.join(", "));
 
 	auto trackAlbum = this->pMetadata.get().value("xesam:album").toString();
 	auto trackAlbumChanged = this->setTrackAlbum(trackAlbum.isNull() ? "Unknown Album" : trackAlbum);

src/services/mpris/player.hpp

@@ -141,7 +141,7 @@ class MprisPlayer: public QObject {
 	/// The current track's album artist, or "Unknown Artist" if none was provided.
 	Q_PROPERTY(QString trackAlbumArtist READ trackAlbumArtist NOTIFY trackAlbumArtistChanged);
 	/// The current track's artists, or an empty list if none were provided.
-	Q_PROPERTY(QVector<QString> trackArtists READ trackArtists NOTIFY trackArtistsChanged);
+	Q_PROPERTY(QString trackArtists READ trackArtists NOTIFY trackArtistsChanged);
 	/// The current track's art url, or `""` if none was provided.
 	Q_PROPERTY(QString trackArtUrl READ trackArtUrl NOTIFY trackArtUrlChanged);
 	/// The playback state of the media player.
@@ -373,7 +373,7 @@ private slots:
 	QString mTrackId;
 	QString mTrackUrl;
 	QString mTrackTitle;
-	QVector<QString> mTrackArtists;
+	QString mTrackArtists;
 	QString mTrackAlbum;
 	QString mTrackAlbumArtist;
 	QString mTrackArtUrl;