fix(接口测试): 修复自定义请求路径中带{}被编码的缺陷

--bug=1029753 --user=王孝刚
【接口测试】github#26488，【接口测试】接口自动化场景-自定义请求，当接口地址里含有变量，勾选引用环境，${变量名}的{}就会被转义编码成其他字符串
https://www.tapd.cn/55049933/s/1409990

api-test/frontend/src/business/automation/scenario/common/CustomizeReqInfo.vue

@@ -170,7 +170,7 @@ export default {
       if (reg.test(urlStr)) {
         let url = this.getURL(urlStr);
         if (url && url.pathname) {
-          this.request.path = url.pathname;
+          this.request.path = decodeURIComponent(url.pathname);
         }
       } else {
         this.request.path = this.request.url;