fix output of traces comming from bctbx tester framework

tester/liblinphone_tester.c

@@ -167,9 +167,7 @@ static void log_handler(int lev, const char *fmt, va_list args) {
 #endif
 	va_end(cap);
 #endif
-	if (log_file){
-		ortp_logv_out(ORTP_LOG_DOMAIN, lev, fmt, args);
-	}
+	bctbx_logv(ORTP_LOG_DOMAIN, lev, fmt, args);
 }
 
 void liblinphone_tester_init(void(*ftester_printf)(int level, const char *fmt, va_list args)) {