Fix logging.

noisicaa/engine/backend_jack.cpp

@@ -239,7 +239,7 @@ private:
 };
 
 BackendJack::BackendJack(const BackendSettings* settings, Engine* engine)
-  : Backend("backend.jack", settings, engine),
+  : Backend("noisicaa.engine.backend_jack", settings, engine),
     _client_name("noisicaa"),
     _next_io_ports(nullptr),
     _current_io_ports(nullptr),
@@ -256,7 +256,7 @@ BackendJack::~BackendJack() {
 void BackendJack::start() {
   jack_status_t status;
 
-  _logger->info("Server: %s", jack_get_version_string());
+  _logger->info("Jack client version: %s", jack_get_version_string());
 
   _logger->info("Opening client '%s'...", _client_name.c_str());
   if (_server_name.empty()) {