bf168ce6f8
follow-up https://github.com/spesmilo/electrum/commit/7a7c0f1606087493bfb0a33eb69b34e5b58f033b - before ref commit, we logged new headers for every interface - after ref commit, we logged new header only for fastest interface - now, we log new header for fastest interface and for main interface - useful to see if main interface is very slow