test: update valgrind suppressions for a glib leak
Fixed upstream, but it's not in F30 yet so the valgrind tests fail there. https://gitlab.gnome.org/GNOME/glib/merge_requests/338
Due to an influx of spam, we have had to impose restrictions on new accounts. Please see this wiki page for instructions on how to get full permissions. Sorry for the inconvenience.
Fixed upstream, but it's not in F30 yet so the valgrind tests fail there. https://gitlab.gnome.org/GNOME/glib/merge_requests/338