ipn/ipnlocal: prevent attempting to run SSH on QNAP for now

tailscaled runs as a non-root user, SSH is not immediately working.

Signed-off-by: Denton Gentry <dgentry@tailscale.com>
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Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f