fix(接口测试): 修复场景变量列表错位的缺陷 (#16836)

--bug=1015716 --user=王孝刚 【接口测试】github#16735，场景变量列表同选框，不在同一行【分辨率1920×1080】 https://www.tapd.cn/55049933/s/1222378

Co-authored-by: wxg0103 <727495428@qq.com>

frontend/src/business/components/api/automation/scenario/variable/VariableList.vue

@@ -344,6 +344,9 @@ export default {
       this.headersOld = JSON.parse(JSON.stringify(this.headers));
       this.visible = true;
       this.disabled = disabled;
+      this.$nextTick(() => {
+        this.$refs.variableTable.doLayout();
+      });
     },
     save() {
       this.visible = false;