Fix ipv4config error in example cluster-class

[isZumpo]

Was getting

.spec.ipv4Config: expected map, got &{[10.10.10.10-10.10.10.20]}

Assuming it is because of this recent commit which did some changes to the cluster-class example.

Removes the .addresses from the patching configuration. With these changes the validation error no longer occurs on my setup.

[sonarqubecloud[bot]]

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