fix(UI 自动化): UI测试计划给默认浏览器

--bug=1015052 --user=张大海 【测试跟踪】执行测试计划，浏览器默认是空的，建议显示默认值 {#_orginal_url#}

frontend/src/business/components/track/plan/common/PlanRunModeWithEnv.vue

@@ -243,7 +243,8 @@
           resourcePoolId: null,
           envMap: new Map(),
           environmentGroupId: "",
-          environmentType: ENV_TYPE.JSON
+          environmentType: ENV_TYPE.JSON,
+          browser: "CHROME"
         };
         this.runModeVisible = false;
         this.$emit('close');