Merge pull request #18743 from smoogipoo/nullable-by-default

Enable NRT by default

osu.Game/Screens/Menu/Disclaimer.cs

@@ -1,6 +1,8 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+#nullable disable
+
 using System.Collections.Generic;
 using System.Linq;
 using osu.Framework.Allocation;