Fix typo in PlaylistManager.cs (extra =) and add missing return statement to GenerateNextSongId() switch

Author: badbl0cks

Orchestrion/Audio/PlaylistManager.cs

@@ -140,7 +140,7 @@ private static int GenerateNextSongId()
 				return CurrentPlaylist.Songs[_currentSongIndex];
 			case RepeatMode.Two:
 				if (_currentSongIndex == -1) { // first repeat
-					_currentSongIndex == -2;
+					_currentSongIndex = -2;
 					return CurrentPlaylist.Songs[0];
 				} else if (_currentSongIndex == -2) { // second repeat
 					_currentSongIndex = 0;
@@ -151,6 +151,7 @@ private static int GenerateNextSongId()
 					} else { // ShuffleMode.On
 						_currentSongIndex = Random.Shared.Next(CurrentPlaylist.Songs.Count);
 					}
+					return CurrentPlaylist.Songs[_currentSongIndex];
 				}
 			case RepeatMode.All when CurrentPlaylist.ShuffleMode == ShuffleMode.Off:
 				_currentSongIndex = ++_currentSongIndex % CurrentPlaylist.Songs.Count;