tests: Disable stderr log color in trau_sync_test

Change-Id: Ibe8e2d580848a41dd25e0ae2d95f83233be6ed9a
diff --git a/tests/trau_sync/trau_sync_test.c b/tests/trau_sync/trau_sync_test.c
index 392a236..d804b3e 100644
--- a/tests/trau_sync/trau_sync_test.c
+++ b/tests/trau_sync/trau_sync_test.c
@@ -79,6 +79,7 @@
 int main(int argc, char **argv)
 {
 	osmo_init_logging2(NULL, NULL);
+	log_set_use_color(osmo_stderr_target, 0);
 	osmo_fsm_log_addr(false);
 	log_set_print_filename2(osmo_stderr_target, LOG_FILENAME_NONE);
 	test_body();