Restore untyped keyword.

I meant to move this to right before `__js__` because it's only needed in Haxe 3, but forgot. Also, I realized Lime always puts it before the `#if`, so I just put it back where it was.

src/lime/_internal/backend/html5/HTML5HTTPRequest.hx

@@ -444,7 +444,7 @@ class HTML5HTTPRequest
 
 	private static function __loadImage(uri:String, promise:Promise<Image>, options:Int):Void
 	{
-		var image:JSImage = #if haxe4 js.Syntax.code #else __js__ #end ('new window.Image ()');
+		var image:JSImage = untyped #if haxe4 js.Syntax.code #else __js__ #end ('new window.Image ()');
 
 		if (!__isSameOrigin(uri))
 		{