fix: unified wrong attribute in song, causing many duplicates

music_kraken/objects/song.py

@@ -126,7 +126,7 @@ class Song(Base):
     def indexing_values(self) -> List[Tuple[str, object]]:
         return [
             ('id', self.id),
-            ('title', unify(self.unified_title)),
+            ('title', unify(self.title)),
             ('isrc', self.isrc),
             *[('url', source.url) for source in self.source_collection]
         ]