fix(flow): 修复流程任务中分配用户昵称获取错误

- 修正了分配用户ID参数传递错误的问题
- 确保从正确的对象中获取分配用户ID
- 避免了因参数错误导致的用户昵称显示异常

fad-hrm/src/main/java/com/ruoyi/hrm/service/impl/HrmFlowTaskServiceImpl.java

@@ -367,7 +367,7 @@ public class HrmFlowTaskServiceImpl implements IHrmFlowTaskService {
             .orderByDesc(HrmFlowTask::getTaskId)
             .last("limit 1");
         HrmFlowTaskVo hrmFlowTaskVo = baseMapper.selectVoOne(lqw);
-        hrmFlowTaskVo.setAssigneeNickName(userService.selectNickNameById(assigneeUserId));
+        hrmFlowTaskVo.setAssigneeNickName(userService.selectNickNameById(hrmFlowTaskVo.getAssigneeUserId()));
         return hrmFlowTaskVo;
     }