Fix stale idle flag when IO workers exit.

Otherwise we could choose a worker that has exited and crash while
trying to wake it up.

Back-patch to 18.

Reported-by: Tomas Vondra <to...@vondra.me>
Reported-by: Andres Freund <and...@anarazel.de>
Discussion: 
https://postgr.es/m/t5aqjhkj6xdkido535pds7fk5z4finoxra4zypefjqnlieevbg%40357aaf6u525j

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/40e105042a4bec83ad8bc39e54edde2caf68d6a8

Modified Files
--------------
src/backend/storage/aio/method_worker.c | 2 ++
1 file changed, 2 insertions(+)

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