cmd/tailscale: make pref-revert checks ignore OS-irrelevant prefs

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This fixes #1833 in two ways:

* stop setting NoSNAT on non-Linux. It only matters on Linux and the flag
  is hidden on non-Linux, but the code was still setting it. Because of
  that, the new pref-reverting safety checks were failing when it was
  changing.

* Ignore the two Linux-only prefs changing on non-Linux.

Fixes #1833

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

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