ipn/auditlog: store the audit log in the backend's state directory

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The store path was hardcoded to %ProgramData%\Tailscale\audit-log.json on
Windows, so a tailscaled run by a regular user with its own --statedir
logged "[unexpected] failed to create audit log store ... Access is denied"
on every profile switch. Use the backend's TailscaleVarRoot when it is
known, falling back to the platform default otherwise. For the Windows
service the state directory is %ProgramData%\Tailscale, so its path is
unchanged; an explicit SetStoreFilePath still wins.

Updates #2791

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
Change-Id: I5d7f9b1c3e5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e

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