fix：“优化添加子账号接口”

src/main/java/com/szwl/controller/TAdminController.java

@@ -155,7 +155,7 @@ public class TAdminController {
 //        List<TAdmin> list = tAdminService.list(query);
         TAdmin admin = tAdminService.getOne(query);
         if (admin != null) {
-            return R.fail(ResponseCodesEnum.A0001);
+            return R.fail(ResponseCodesEnum.A0201);
         }
         TAdmin entity = BeanUtil.copyProperties(param, TAdmin.class);
         entity.setParentId(parentId);