fix：修复ChangeNotifier没有释放问题；

lib/Customization/Customization.dart

@@ -50,6 +50,7 @@ class _CustomizationListImgState extends State<_CustomizationListImg> {
   @override
   void dispose() {
     _refreshController.dispose();
+    widget.viewModel.dispose();
     super.dispose();
   }