ssh/tailssh: treat numerically-zero uids as root in isRootUser

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An NSS uid like "00" passed the string != "0" check but parses to 0 in
the incubator, so a session could bypass non-root checks and run as
root. Compare the uid numerically instead; non-numeric uids keep the
previous behavior.

Updates tailscale/corp#50380

Signed-off-by: James Tucker <james@tailscale.com>

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