Describe the bug

#340489 seems to have introduced two lines that apply a chown where a chmod seems to have been intended.

This makes VMs using that module unavailable via SSH since permissions are incorrect.

Steps To Reproduce

Steps to reproduce the behavior:

1. Build NixOS config using unstable branch and ec2-data (e.g. openstack-config)
2. Switch
3. check permissions of /etc/ssh

Expected behavior

/etc/ssh and root/.ssh should be owned by root and have permissions of 0755 / 0700

Notify maintainers

@r-vdp

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