fix(测试计划): 测试规划-新增测试点保存后点击用例数-展示关联窗口

--bug=1046657 --user=吕梦园
https://www.tapd.cn/55049933/bugtrace/bugs/view/1155049933001046657

frontend/src/components/business/ms-minders/testPlanMinder/index.vue

@@ -1025,6 +1025,7 @@
       loading.value = true;
       await editPlanMinder(makeMinderParams(window.minder.exportJson()));
       Message.success(t('common.saveSuccess'));
+      inInsertingNode.value = false;
       emit('save');
       clearSelectedCases();
       handleConfigCancel();