net/portmapper/pcp: use all-zero address for PCP releases

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The PCP spec says that when deleting a mapping, both the external
port and the external address must be zero. While PCP servers are
likely to be lenient in practice, we should do the right thing in
case we encounter strict validation.

Resolves #21363

Change-Id: Ice3467d735def5144a810c39e65642988a830972
Signed-off-by: Francois Marier <francois@tailscale.com>

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