fix(sync): when called with --only-peers
fix(sync): when called with --only-peers

When 'sync' is called with option '--only-peers', the path to function
'RemoteSynchronizer.getPeers()' is not the same as the default.

In this case we need to ensure that 'init()' was properly called and
proceed without a watcher.

duniter/duniter,duniter/duniter,duniter/duniter,duniter/duniter,duniter/duniter,duniter/duniter