fix(测试跟踪): 用例表头刷新时页面显示延迟

--bug=1024842 --user=宋昌昌 【测试跟踪】github#23067，脑图切换到列表时，加载过程中会显示多余的页面 https://www.tapd.cn/55049933/s/1358470

test-track/frontend/src/business/case/TestCase.vue

@@ -266,13 +266,6 @@ export default {
         this.refresh();
       }
     },
-    activeDom(newVal, oldVal) {
-      this.$nextTick(() => {
-        if (oldVal !== 'left' && newVal === 'left' && this.$refs.testCaseList) {
-          this.$refs.testCaseList.getTemplateField();
-        }
-      });
-    },
     trashEnable() {
       if (this.trashEnable) {
         this.activeName = 'trash';

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

@@ -626,6 +626,7 @@ export default {
         });
       let p2 = getTestTemplate();
       Promise.all([p1, p2]).then((data) => {
+        this.loading = false;
         let template = data[1];
         this.testCaseTemplate = template;
         this.fields = getTableHeaderWithCustomFields(this.tableHeaderKey, this.testCaseTemplate.customFields, this.members);
@@ -637,16 +638,6 @@ export default {
           name: this.$t('commons.tag')
         })
         getCustomFieldBatchEditOption(template.customFields, this.typeArr, this.valueArr, this.members);
-
-        this.$nextTick(() => {
-          if (this.$refs.table) {
-            this.$refs.table.resetHeader(() => {
-              this.loading = false;
-            });
-          } else {
-            this.loading = false;
-          }
-        });
       });
     },
     checkCurrentProject() {