[edpm_prepare] Fix outside zuul when clause

[evallesp]

It seems we're checking a task var in the same task when clause which make the task fails as ansible first checks the when before init the vars section.

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[softwarefactory-project-zuul]

Build failed (check pipeline). Post recheck (without leading slash)
to rerun all jobs. Make sure the failure cause has been resolved before
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https://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/c63580fcccb94f8caab856f689e0169a

✔️ openstack-k8s-operators-content-provider SUCCESS in 3h 19m 04s
✔️ podified-multinode-edpm-deployment-crc SUCCESS in 1h 25m 16s
❌ cifmw-crc-podified-edpm-baremetal FAILURE in 47m 18s
✔️ cifmw-crc-podified-edpm-baremetal-minor-update SUCCESS in 2h 08m 16s
✔️ cifmw-pod-zuul-files SUCCESS in 5m 06s
✔️ adoption-standalone-to-crc-ceph-provider SUCCESS in 3h 02m 25s
✔️ noop SUCCESS in 0s
✔️ cifmw-pod-ansible-test SUCCESS in 8m 59s
❌ cifmw-pod-pre-commit TIMED_OUT in 31m 04s
✔️ build-push-container-cifmw-client SUCCESS in 20m 23s
✔️ cifmw-molecule-edpm_prepare SUCCESS in 4m 50s