fix(测试跟踪)：脑图切换到列表时，加载过程中会显示多余的页面

--bug=1024842 --user=王旭 【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/1357972

framework/sdk-parent/frontend/src/components/new-ui/MsTable.vue

@@ -536,12 +536,15 @@ export default {
     openCustomHeader() {
       this.$refs.customTableHeader.open(this.fields);
     },
-    resetHeader() {
+    resetHeader(callback) {
       this.$emit('update:fields', getCustomTableHeader(this.fieldKey, this.customFields));
       this.tableActive = false;
       this.$nextTick(() => {
         this.doLayout();
         this.tableActive = true;
+        if (callback) {
+          callback();
+        }
       });
       this.listenRowDrop();
     },

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

@@ -640,9 +640,12 @@ export default {
 
         this.$nextTick(() => {
           if (this.$refs.table) {
-            this.$refs.table.resetHeader();
+            this.$refs.table.resetHeader(() => {
+              this.loading = false;
+            });
+          } else {
+            this.loading = false;
           }
-          this.loading = false;
         });
       });
     },