fix(功能用例):功能用例编辑后用例步骤未更新

--bug=1010011 --user=李敏 【测试跟踪】github#9987，用例变更之后返回列表预览还是老的内容，列表没有及时刷新 https://www.tapd.cn/55049933/s/1106397

frontend/src/business/components/track/case/components/TestCaseList.vue

@@ -850,14 +850,6 @@ export default {
     getCase(id) {
       this.$refs.testCasePreview.open();
       this.rowCaseResult.loading = true;
-      if (this.rowCase && this.rowCase.id === id) {
-        this.$refs.testCasePreview.setData(this.rowCase);
-        this.rowCaseResult.loading = false;
-        return;
-      } else {
-        this.rowCase = {};
-        this.$refs.testCasePreview.setData({});
-      }
 
       this.rowCaseResult = this.$get('test/case/get/step/' + id, response => {
         this.rowCase = response.data;