wgengine/wglog: match upstream wireguard-go's code for wireguardGoString

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It is a bit faster.

But more importantly, it matches upstream byte-for-byte,
which ensures there'll be no corner cases in which we disagree.

name        old time/op    new time/op    delta
SetPeers-8    3.58µs ± 0%    3.16µs ± 2%  -11.74%  (p=0.016 n=4+5)

name        old alloc/op   new alloc/op   delta
SetPeers-8    2.53kB ± 0%    2.53kB ± 0%     ~     (all equal)

name        old allocs/op  new allocs/op  delta
SetPeers-8      99.0 ± 0%      99.0 ± 0%     ~     (all equal)

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>

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