ipn: make LoadPrefs return os.ErrNotExist when reading corrupted files

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It appears some users have corrupted pref.conf files. Have LoadPrefs
treat these files as non-existent. This way tailscale will make user
login, and not crash.

Fixes #954

Signed-off-by: Alex Brainman <alex.brainman@gmail.com>

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500 Internal Server Error

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