refactor(测试跟踪): 测试计划关联功能用例页面，打开时清除上次排序

--bug=1025123 --user=陈建星 【测试跟踪】测试计划-关联功能用例-按ID升序-关联后关闭再次关联-仍显示按ID升序-实际列表数据恢复了默认排序（按ID降序） https://www.tapd.cn/55049933/s/1361552

framework/sdk-parent/frontend/src/components/table/MsTable.vue

@@ -569,7 +569,6 @@ export default {
     },
     clearSort() {
       this.defaultSort = {};
-      this.setDefaultOrders();
     },
     getSelectRows() {
       return this.selectRows;

test-track/frontend/src/business/plan/view/comonents/base/RelevanceDialog.vue

@@ -16,7 +16,7 @@
       <slot name="headerBtn"></slot>
     </el-header>
 
-    <el-container class="main-content">
+    <el-container v-if="dialogVisible" class="main-content">
       <el-aside class="tree-aside" width="250px">
         <slot name="aside"></slot>
       </el-aside>