Fix nodeTaintsPolicy panic when NodeAffinityPolicy undefined

[tzasacky]

Description

Typo causes panic when TopologySpreadConstraints includes nodeTaintsPolicy and not NodeAffinityPolicy.

Acceptance tests

Trivially correct, N/A

• [ ] Have you added an acceptance test for the functionality being added?
• [ ] Have you run the acceptance tests on this branch?

References

https://github.com/hashicorp/terraform-provider-kubernetes/issues/2490

Community Note

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