net/ping: fix ICMP echo code field to 0

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The code was trying to pass the ICMP protocol number here (1), which is
not a valid code. Many servers will not respond to echo messages with
codes other than 0.

https://www.iana.org/assignments/icmp-parameters/icmp-parameters.xhtml#icmp-parameters-codes-8

Updates #9299
Signed-off-by: James Tucker <james@tailscale.com>

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500 Internal Server Error

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