preflight: fix path for IBM GPG key (backport #210)

[mergify]

This is an automatic backport of pull request #210 done by Mergify.
Cherry-pick of 2d0718b has failed:

On branch mergify/bp/quincy/pr-210
Your branch is up to date with 'origin/quincy'.

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	both modified:   ceph_defaults/defaults/main.yml

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To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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