fix(接口定义): 修复用例加载后未及时刷新问题

--bug=1007961 --user=赵勇 【接口测试】接口定义-test-加载用例，选择用例后，没有加载用例的json请求体 https://www.tapd.cn/55049933/s/1068130

frontend/src/business/components/api/definition/components/body/ApiBody.vue

@@ -130,6 +130,9 @@ export default {
   },
 
   watch: {
+    'body.typeChange'(){
+      this.reloadCodeEdit();
+    },
     'body.raw'() {
       if (this.body.format !== 'JSON-SCHEMA' && this.body.raw) {
         try {

frontend/src/business/components/api/definition/components/request/http/ApiHttpRequestForm.vue

@@ -198,6 +198,9 @@ export default {
       if (this.request.arguments && this.request.arguments.length > 1) {
         this.activeName = 'parameters';
       }
+      if(this.request.body) {
+        this.request.body.typeChange = this.request.changeId;
+      }
       this.reload();
     }
   },