fix(接口测试): 修复场景报告批量展开步骤不显示内容的缺陷

--bug=1025752 --user=王孝刚 【测试跟踪】执行测试计划-失败重跑2次-执行完成后Error Tab一键展开查看场景失败
https://www.tapd.cn/55049933/s/1366208

api-test/frontend/src/business/automation/report/components/InfiniteScrollScenarioResults.vue

@@ -113,7 +113,6 @@ export default {
       this.changeTreeNodeStatus(this.$refs.resultsTree.store.root, 0);
     },
     openExpansion() {
-      this.isActive = true;
       this.expandAll = true;
       // 改变每个节点的状态
       this.changeTreeNodeStatus(this.$refs.resultsTree.store.root, 0);