Fix typo mistake in roles/kubernetes/control-plane/tasks/define-first-kube-control.yml

[kimsehwan96]

Fix 'Set fact joined_control_panes' into 'Set fact joined_control_planes'

What type of PR is this?
/kind documentation

What this PR does / why we need it:

This PR is for fixing typo mistake in roles/kubernetes/control-plane/tasks/define-first-kube-control.yml.

I wonder that this change is really needed but I think its better that fix this kind of mistake

Which issue(s) this PR fixes:

It doesn't related with any issue.

Special notes for your reviewer:

Nothing.

Does this PR introduce a user-facing change?:

Fix typo mistake in roles/kubernetes/control-plane/tasks/define-first-kube-control.yml 

[k8s-ci-robot]

Hi @kimsehwan96. Thanks for your PR.

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[floryut]

@kimsehwan96 Thanks for the fix

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floryut, kimsehwan96

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[floryut]

/ok-to-test

[floryut]

Don't need to wait for a whole CI circle for that I guess, force merging this 👍