logpolicy: don't use C:\ProgramData use for tailscale-ipn GUI's log dir

tailscale-ipn.exe (the GUI) shouldn't use C:\ProgramData.

Also, migrate the earlier misnamed wg32/wg64 conf files if they're present.
(That was stopped in 2db877caa3, but the
files exist from fresh 1.14 installs)

Updates #2856

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