fix(系统设置): 修复资源池日志记录操作人不对问题

--bug=1039332 --user=郭雨琦 https://www.tapd.cn/55049933/bugtrace/bugs/view/1155049933001039332

backend/services/system-setting/src/main/java/io/metersphere/system/service/TestResourcePoolService.java

@@ -240,7 +240,7 @@ public class TestResourcePoolService {
                     OperationLogConstants.SYSTEM,
                     OperationLogConstants.SYSTEM,
                     pool.getId(),
-                    pool.getCreateUser(),
+                    null,
                     OperationLogType.UPDATE.name(),
                     OperationLogModule.SETTING_SYSTEM_RESOURCE_POOL,
                     request.getName());