This fixes a bug introduced by 6d93265955.
The commit makes several functions skipped if the manager is already
in finished state, as
> In manager_check_finished(), more steps are skipped if MANAGER_IS_FINISHED().
> Those steps are idempotent, but no need to waste cycles trying to do them
> more than once.
However, the idle pipe may be re-opened after manager is finished:
manager_dispatch_run_queue() -> manager_watch_idle_pipe().
So, the closing the pipe is not idempotent here.
Fixes #21889.
System and Service Manager
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