Fix cilium template by specifying boolean as a string for enable-metrics

[h3poteto]

Fixes: #10081

Cilium ConfigMap template was wrong, so I fixed it.
I confirmed that kops can successfully create clusters using this change when enablePrometheusMetrics is specified for Cilium.

[k8s-ci-robot]

Hi @h3poteto. Thanks for your PR.

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[olemarkus]

/ok-to-test

[olemarkus]

You can add
Fixes #10081
to your initial comment to properly link and auto-close the issue upon merge.

[olemarkus]

Thanks for catching this. Could now replicate and confirm the bug. I changed the config on an already-working cluster, which is why I couldn't reproduce earlier.

/lgtm

[hakman]

Thanks @h3poteto .
@olemarkus Could you cherry-pick this?
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: h3poteto, hakman

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[h3poteto]

Thank you for reviewing.