Removing pre-shared key from peer using wg set fails

[Tim Sedlmeyer]

Removal of the preshared-key from a peer using the 'wg set' command and
providing /dev/null or an empty file as the preshared-key filename does not
result in the key being removed from the peer. The command doesn't return
an error, but it also doesn't remove the key. I have attempted it using
0.0.20171111 and 0.0.20171122.

Supplying /dev/null or an empty file as the filename does work properly for
removing the interface private-key.
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