cull(engine-cleanup): pass-8 phase-2 cascade round 2 after GachaUI stub

SVSim.BattleEngine/Shim/UnityEngine/UnityShim2.cs

@@ -34,8 +34,6 @@ namespace UnityEngine
     public partial class Light : Behaviour { }
     public class AudioListener : Behaviour { }
 
-    public enum RenderTextureFormat { Default }
-
     public enum RuntimeInitializeLoadType
     {
     }