Add using statements lost in cherry-pick

Author: Dansla116

Assets/Script/Menu/MusicLibrary/SongSorting.cs

@@ -5,6 +5,8 @@
 using YARG.Core.Song;
 using YARG.Core.Utility;
 using YARG.Helpers;
+using YARG.Helpers.Extensions;
+using YARG.Settings;
 using static YARG.Core.Song.SongEntrySorting;
 
 namespace YARG.Menu.MusicLibrary