wgengine/magicsock: disable portmapper in tunchan-faked tests

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Most of the magicsock tests fake the network, simulating packets going
out and coming in. There's no reason to actually hit your router to do
UPnP/NAT-PMP/PCP during in tests. But while debugging thousands of
iterations of tests to deflake some things, I saw it slamming my
router. This stops that.

Updates #11762

Change-Id: I59b9f48f8f5aff1fa16b4935753d786342e87744
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

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