talm.discovered.default_link_selector_by_gateway might generate duplicated keys for selector


```
~/Web/DevOps/k8s/talos$ ./talm -n 65.108.***.*** -e 65.108.***.*** template -t templates/controlplane.yaml -i > nodes/node1.yaml
failed to render templates: error decoding  to *v1alpha1.Config: yaml: unmarshal errors:
  line 34: mapping key "hardwareAddr" already defined at line 32
  line 35: mapping key "driver" already defined at line 33
```