fixed visibility of lyrics

Vocaluxe/Lib/Song/CSong.cs

@@ -209,6 +209,7 @@ namespace Vocaluxe.Lib.Song
             this.VideoAspect = song.VideoAspect;
             this._CoverLoaded = song._CoverLoaded;
             this.CoverBigLoaded = song.CoverBigLoaded;
+            this._NotesLoaded = song._NotesLoaded;
 
             this.Artist = song.Artist;
             this.Title = song.Title;