Remove duplicate nodeSelector

[millermatt]

/kind bug

What this PR does / why we need it:

Makes the dns-horizontal-autoscaler.yaml file valid yaml.

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[k8s-ci-robot]

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[millermatt]

/assign @MrHohn

[MrHohn]

Thanks!
/lgtm
/approve

[MrHohn]

/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: millermatt, MrHohn

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• cluster/addons/dns-horizontal-autoscaler/OWNERS [MrHohn]

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[MrHohn]

/release-note-none