Do not overwrite topology for designate-backend-bind9 statefulset

[marbindrakon]

The existing code sets the statefulset affinity based on a provided Topology object if provided. However, another section of code immediately throws that away and implements the default.

This PR removes that redundant section so that Topology objects are respected with the existing behavior as the default when a Topology is not provided.

[openshift-ci]

Hi @marbindrakon. Thanks for your PR.

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[fmount]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: fmount, marbindrakon
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[fmount]

Good catch, thank you.

[fmount]

/test functional

[beagles]

/lgtm