tests: Add missing unit test to GLib tests list
tests: Add missing unit test to GLib tests list

It must have been accidentally omitted during the Meson port.

Signed-off-by: Philip Withnall <29c2a2ac2a854b9cf047275aa9de346d096be2e0@endlessm.com>

endlessm/glib,endlessm/glib,endlessm/glib,endlessm/glib,endlessm/glib