Temporarily remove nullSafety in two classes

source/funkin/ui/MusicBeatState.hx

@@ -25,7 +25,8 @@ import funkin.play.notes.NoteDirection;
  * MusicBeatState actually represents the core utility FlxState of the game.
  * It includes functionality for event handling, as well as maintaining BPM-based update events.
  */
-@:nullSafety
+// TODO: Add nullSafety back here.
+// @:nullSafety
 class MusicBeatState extends FlxTransitionableState implements IEventHandler
 {
   var controls(get, never):Controls;

source/funkin/ui/MusicBeatSubState.hx

@@ -23,7 +23,8 @@ import funkin.play.notes.NoteDirection;
 /**
  * MusicBeatSubState reincorporates the functionality of MusicBeatState into an FlxSubState.
  */
-@:nullSafety
+// TODO: Add nullSafety back here.
+// @:nullSafety
 class MusicBeatSubState extends FlxSubState implements IEventHandler
 {
   public var leftWatermarkText:Null<FlxText> = null;