fix(接口定义): 修复除http协议TEST页面加载用例显示成了新建用例页面的缺陷

--bug=1015457 --user=王孝刚 【接口测试】TCP、SQL、DUBBO接口-TEST页面-加载用例，显示成了新建用例页面
https://www.tapd.cn/55049933/s/1214534

frontend/src/business/components/api/definition/components/runtest/RunTestDubboPage.vue

@@ -142,6 +142,7 @@ export default {
     },
     loadCase() {
       this.refreshSign = getUUID();
+      this.loaded = true;
       this.$refs.caseList.open();
       this.visible = true;
     },

frontend/src/business/components/api/definition/components/runtest/RunTestSQLPage.vue

@@ -142,6 +142,7 @@ export default {
     },
     loadCase() {
       this.refreshSign = getUUID();
+      this.loaded = true;
       this.$refs.caseList.open();
       this.visible = true;
     },

frontend/src/business/components/api/definition/components/runtest/RunTestTCPPage.vue

@@ -214,8 +214,9 @@ export default {
     },
     loadCase() {
       this.refreshSign = getUUID();
-      this.$refs.caseList.open();
       this.visible = true;
+      this.loaded = true;
+      this.$refs.caseList.open();
     },
     apiCaseClose() {
       this.visible = false;