Remove duplicate isDir attribute from song XML

src/routes/subsonic.js

@@ -194,9 +194,7 @@ router.get('/getMusicDirectory.view', authenticateSubsonic, async (req, res) =>
       let dirXml = `<directory id="${id}" parent="${parentArtistId}" name="${escapeXml(targetAlbum)}">\n`;
       
       tracks.forEach(track => {
-        const songXml = buildSongXml(track, req);
-        // Replace the closing /> with isDir="false" />
-        dirXml += songXml.replace('type="music"/>', 'type="music" isDir="false"/>');
+        dirXml += buildSongXml(track, req);
       });
       
       dirXml += '</directory>';