some lil null safety fix for SwipeUtil

source/funkin/ui/freeplay/FreeplayState.hx

@@ -1846,8 +1846,6 @@ class FreeplayState extends MusicBeatSubState
     {
       if (_pressedOnSelected && TouchUtil.touch != null)
       {
-        // Have to turn off null safety in-order to compile this!! -Zack
-        @:nullSafety(Off)
         if (SwipeUtil.swipeLeft)
         {
           draggingDifficulty = true;
@@ -2266,7 +2264,6 @@ class FreeplayState extends MusicBeatSubState
   #if FEATURE_TOUCH_CONTROLS
   function handleDiffDragRelease(diff:FlxSprite):Void
   {
-    @:nullSafety(Off)
     if ((diffSelLeft != null && diffSelLeft.x + 20 > diff.x) || SwipeUtil.justSwipedLeft)
     {
       handleDiffBoundaryChange(1);

source/funkin/util/SwipeUtil.hx

@@ -143,7 +143,7 @@ class SwipeUtil
   {
     #if FEATURE_TOUCH_CONTROLS
     #if mobile
-    return TouchUtil.touch != null && TouchUtil.touch.justMovedUp;
+    return TouchUtil.touch?.justMovedUp ?? false;
     #else
     return FlxG.mouse.justMovedUp && FlxG.mouse.pressed;
     #end
@@ -157,7 +157,7 @@ class SwipeUtil
   {
     #if FEATURE_TOUCH_CONTROLS
     #if mobile
-    return TouchUtil.touch != null && TouchUtil.touch.justMovedRight;
+    return TouchUtil.touch?.justMovedRight ?? false;
     #else
     return FlxG.mouse.justMovedRight && FlxG.mouse.pressed;
     #end
@@ -171,7 +171,7 @@ class SwipeUtil
   {
     #if FEATURE_TOUCH_CONTROLS
     #if mobile
-    return TouchUtil.touch != null && TouchUtil.touch.justMovedLeft;
+    return TouchUtil.touch?.justMovedLeft ?? false;
     #else
     return FlxG.mouse.justMovedLeft && FlxG.mouse.pressed;
     #end
@@ -185,7 +185,7 @@ class SwipeUtil
   {
     #if FEATURE_TOUCH_CONTROLS
     #if mobile
-    return TouchUtil.touch != null && TouchUtil.touch.justMovedDown;
+    return TouchUtil.touch?.justMovedDown ?? false;
     #else
     return FlxG.mouse.justMovedDown && FlxG.mouse.pressed;
     #end