Drop use of log_set_print_filename() API inside libosmocore

Let's use log_set_print_filename2() API instead, which has less ackward
behavior implications like changing the print status of category-hex.

Related: OS#5034
Change-Id: Ifc78e1dcba5baf0b41f6ccbbbd1e3f06552d73da
diff --git a/tests/gb/gprs_ns_test.c b/tests/gb/gprs_ns_test.c
index e8e8b80..454a29e 100644
--- a/tests/gb/gprs_ns_test.c
+++ b/tests/gb/gprs_ns_test.c
@@ -906,11 +906,9 @@
 	log_set_use_color(osmo_stderr_target, 0);
 	log_set_print_category(osmo_stderr_target, 0);
 	log_set_print_category_hex(osmo_stderr_target, 0);
-	log_set_print_filename(osmo_stderr_target, 0);
-	osmo_signal_register_handler(SS_L_NS, &test_signal, NULL);
-
-	log_set_print_filename(osmo_stderr_target, 0);
+	log_set_print_filename2(osmo_stderr_target, LOG_FILENAME_NONE);
 	log_set_log_level(osmo_stderr_target, LOGL_INFO);
+	osmo_signal_register_handler(SS_L_NS, &test_signal, NULL);
 
 	setlinebuf(stdout);