Update ulut to "Document ul_log_domain_arg2levels()"

diff --git a/src/ulut b/src/ulut
index da27c404231e2f29a015566de2b34b01088fc016..ad01c7a80936800bb49328167b5c5190fb3c82ad 160000 (submodule)
--- a/src/ulut
+++ b/src/ulut
@@ -1 +1 @@
-Subproject commit da27c404231e2f29a015566de2b34b01088fc016
+Subproject commit ad01c7a80936800bb49328167b5c5190fb3c82ad