dht_proxy_server: fix push notifications if tls is enabled

If the proxy got TLS enabled, this doesn't mean that the REST
endpoint for push notifications is also using TLS.

Also, fix an incorrect log.

src/dht_proxy_server.cpp

@@ -1018,7 +1018,7 @@ DhtProxyServer::sendPushNotification(const std::string& token, Json::Value&& jso
     unsigned reqid = 0;
     try {
         auto request = std::make_shared<http::Request>(io_context(), pushHostPort_.first, pushHostPort_.second,
-                                                                    httpsServer_ ? true : false, logger_);
+                                                            pushHostPort_.first.find("https://") == 0, logger_);
         reqid = request->id();
         request->set_target("/api/push");
         request->set_method(restinio::http_method_post());
@@ -1078,7 +1078,7 @@ DhtProxyServer::sendPushNotification(const std::string& token, Json::Value&& jso
     }
     catch (const std::exception &e){
         if (logger_)
-            logger_->e("[proxy:server] [notification] error send push: %i", e.what());
+            logger_->e("[proxy:server] [notification] error send push: %s", e.what());
         if (reqid) {
             std::lock_guard<std::mutex> l(requestLock_);
             requests_.erase(reqid);