build-scripts/guix.scm: Fix missing glib module.
build-scripts/guix.scm: Fix missing glib module.

Besides, thanks to gobject-introspection, glib is dragged a long and
GIO_EXTRA_MODULES is set, so there is no need for add the ad-hoc inputs anymore
when running Nyxt.

jmercouris/NeXT,jmercouris/NeXT