daemon: Use separate method to set default loggers

This way it is not necessary to pass the same values to reload the
loggers.

src/libcharon/tests/libcharon_tests.c

@@ -45,7 +45,7 @@ static void initialize_logging()
 	lib->settings->set_int(lib->settings, "%s.filelog.stderr.default",
 			lib->settings->get_int(lib->settings, "%s.filelog.stderr.default",
 								   level, lib->ns), lib->ns);
-	charon->load_loggers(charon, NULL, TRUE);
+	charon->load_loggers(charon);
 }
 
 static bool test_runner_init(bool init)

src/libcharon/tests/utils/exchange_test_helper.c

@@ -282,7 +282,7 @@ static void initialize_logging()
 								   level, lib->ns), lib->ns);
 	lib->settings->set_bool(lib->settings, "%s.filelog.stderr.ike_name", TRUE,
 							lib->ns);
-	charon->load_loggers(charon, NULL, TRUE);
+	charon->load_loggers(charon);
 }
 
 /**