qa/tasks: fix syntax for deep-scrub command

[ljflores]

Fixes: https://tracker.ceph.com/issues/63967

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[ronen-fr]

@ljflores - I'd recommend merging this now, based on the available testing (and a few more that I have run).
The misspelled command is causing multiple test failures.

[ljflores]

Tested here: https://trello.com/c/D0n65np1/1923-wip-yuri-testing-2024-01-09-1331

No related failures.

[cbodley]

thanks @athanatos @ljflores

[kamoltat]

RADOS APPROVED
https://tracker.ceph.com/projects/rados/wiki/MAIN#httpstrellocomcD0n65np11923-wip-yuri-testing-2024-01-09-1331