修复destroySystems没有清空的bug

.gitignore

@@ -48,3 +48,4 @@ _ReSharper.CSharp/
 Server/.DS_Store
 /Server/.vscode/
 .vs/
+.objs/

Unity/Assets/Model/Base/Object/EventSystem.cs

@@ -72,6 +72,7 @@ namespace ETModel
 			this.startSystems.Clear();
 			this.loadSystems.Clear();
 			this.changeSystems.Clear();
+			this.destroySystems.Clear();
 			this.deserializeSystems.Clear();
 
 			foreach (Type type in types[typeof(ObjectSystemAttribute)])