fix(ops/modules): adapt for changed ssh.knownHosts r/4122

Somehow this ended up generating an empty file, with this change it is
fine again. I was looking at the recent commits of the module in
nixpkgs but couldn't quite figure it out, there are also some vague
references to the attribute set key being used as a hostname, but this
doesn't seem to be true in practice.

To be clear, the previous code was wrong, but at some point it
generated a file that accidentally worked.

Change-Id: I42d55730c09daafe6d6fe0eb3647135e84737bca
Reviewed-on: https://cl.tvl.fyi/c/depot/+/5670
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
Autosubmit: tazjin <tazjin@tvl.su>

0 files changed, 0 insertions, 0 deletions