version/distro,wgengine/router: raise WSL eth0 MTU when too low

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WSL has started to set the eth0 default route interface default to 1280
MTU, which is too low to carry 1280 byte packets from tailscale0 once
wrapped in WireGuard. The change down to 1280 is very likely smaller
than necessary for almost all users. We can not easily determine the
ideal MTU, but if all the preconditions match, we raise the MTU to 1360,
which is just enough for Tailscale traffic to work.

Updates #4833
Updates #7346

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

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