fix(UI自动化): 测试计划关联UI对话框样式

--bug=1016644 --user=张大海 【测试跟踪】测试计划-UI测试用例-复选框下来箭头位置未居中 https://www.tapd.cn/55049933/s/1265135

test-track/frontend/src/business/plan/view/comonents/ui/RelevanceUiScenarioList.vue

@@ -249,8 +249,9 @@ export default {
 </script>
 
 <style scoped>
-:deep(.el-drawer__header) {
-  margin-bottom: 0px;
+
+:deep(.ms-select-all-fixed th:nth-child(2) .table-select-icon) {
+  top: -3px!important;
 }
 
 .env-popover {