minor stun refactor (#18752)

* file scope

* stun autogen state

---------

Co-authored-by: deltanedas <@deltanedas:kde.org>

Content.Shared/Stunnable/StunnedComponent.cs

@@ -1,10 +1,8 @@
 using Robust.Shared.GameStates;
 
-namespace Content.Shared.Stunnable
+namespace Content.Shared.Stunnable;
+
+[RegisterComponent, NetworkedComponent, Access(typeof(SharedStunSystem))]
+public sealed class StunnedComponent : Component
 {
-    [Access(typeof(SharedStunSystem))]
-    [RegisterComponent, NetworkedComponent]
-    public sealed class StunnedComponent : Component
-    {
-    }
 }