daemon mode broken (again?)

[nshalman]

As noted in @jclulow's original port README, the original port didn't work with the wireguard-go daemonization code and had to be run in foreground mode.

I thought at some point that I had fixed that, but memory is a fickle thing.

If you run into that issue, the solution is the same as it was in the beginning:

wireguard-go must be run in the foreground (i.e., using -f)