fix syntax on cloudflare externalDNS

[ilyesAj]

Description

Fix syntax on the creation of secret and updating keys

Fixes #ISSUE

Checklist

• Unit tests updated
• End user documentation updated

[linux-foundation-easycla]

• ✅login: ilyesAj / (7a9af84)

The committers listed above are authorized under a signed CLA.

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[k8s-ci-robot]

Hi @ilyesAj. Thanks for your PR.

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[mloiseleur]

Thanks for this PR @ilyesAj
/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mloiseleur

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