fix: a small bug with child formatting

rave/src/subsonic/types/child.rs

@@ -79,7 +79,7 @@ impl Child {
                 .created
                 .format(&Iso8601::DEFAULT)
                 .expect("Failed to format date"),
-            album_id: Some(format!("al-{}", album.id)),
+            album_id: Some(album.id.clone()),
             artist_id: track.artist_id.map(|v| format!("ar-{v}",)),
             artist: artist.name.clone(),
             child_type: "music".to_string(),