Add a forgotten g_type_ensure call
Add a forgotten g_type_ensure call

One of the types in this function was not wrapped in a
g_type_ensure_call, an obvious oversight.

endlessm/glib,endlessm/glib,johne53/MB3Glib,endlessm/glib,johne53/MB3Glib,endlessm/glib,johne53/MB3Glib,johne53/MB3Glib,endlessm/glib,johne53/MB3Glib,johne53/MB3Glib