!1972 sched/fair: fix qos_idle_h_nr_running in enqueue/dequeue

Merge Pull Request from: @zhangwei123171 
 

When the container switches from offline mode to online mode, or from offline mode to online mode, qos_idle_h_nr_running will count errors.

If task se is counted according to the online task when it enters rq, then it must also be counted according to
the online task when it leaves the rq. 
 
Link:https://gitee.com/openeuler/kernel/pulls/1972

 

Reviewed-by: zhao xiaoqiang <zhaoxiaoqiang11@jd.com>
Reviewed-by: Zucheng Zheng <zhengzucheng@huawei.com>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>