fix Hetzner group names

[jmaccabee13]

The inventory file generated by the Hetzner Terraform file currently fails early. It produces the following warnings:

[WARNING]:  * Failed to parse <PATH>/kubespray/contrib/terraform/hetzner/inventory.ini with ini plugin:
<PATH>/kubespray/contrib/terraform/hetzner/inventory.ini:21: Section [k8s_cluster:children] includes undefined group: kube-master
...
[WARNING]: Could not match supplied host pattern, ignoring: kube-master

PLAY [Add kube-master nodes to kube_control_plane] ********************************************************************************************************
skipping: no hosts matched
[WARNING]: Could not match supplied host pattern, ignoring: kube-node

PLAY [Add kube-node nodes to kube_node] *******************************************************************************************************************
skipping: no hosts matched

What type of PR is this?

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/kind api-change
/kind bug
/kind cleanup
/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Fix Hetzner kubernetes group names

[linux-foundation-easycla]

• ✅login: jmaccabee13 / (52bbed9)

The committers listed above are authorized under a signed CLA.

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[yankay]

/ok-to-test

[ant31]

/lgtm

[floryut]

🥳

[ant31]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ant31, floryut, jmaccabee13

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