Add fedora-workstation-repositories to nonfree-sources schema defaults

This sets up gnome-software to offer installing the
fedora-workstation-repositories package in the Software Sources dialog,
as per the guidance given by Fedora Council:

https://pagure.io/Fedora-Council/tickets/issue/121

gnome-software.spec

@@ -11,7 +11,7 @@
 
 Name:      gnome-software
 Version:   3.27.4
-Release:   2%{?dist}
+Release:   3%{?dist}
 Summary:   A software center for GNOME
 
 License:   GPLv2+
@@ -122,6 +122,7 @@ desktop-file-edit %{buildroot}%{_datadir}/applications/org.gnome.Software.deskto
 cat >> %{buildroot}%{_datadir}/glib-2.0/schemas/org.gnome.software-fedora.gschema.override << FOE
 [org.gnome.software]
 official-sources = [ 'fedora', 'fedora-debuginfo', 'fedora-source', 'koji-override-0', 'koji-override-1', 'rawhide', 'rawhide-debuginfo', 'rawhide-source', 'updates', 'updates-debuginfo', 'updates-source', 'updates-testing', 'updates-testing-debuginfo', 'updates-testing-source' ]
+nonfree-sources = [ 'fedora-workstation-repositories' ]
 FOE
 
 %find_lang %name --with-gnome
@@ -213,6 +214,9 @@ desktop-file-validate %{buildroot}%{_datadir}/applications/*.desktop
 %{_mandir}/man1/gnome-software-editor.1*
 
 %changelog
+* Thu Feb 08 2018 Kalev Lember <klember@redhat.com> - 3.27.4-3
+- Add fedora-workstation-repositories to nonfree-sources schema defaults
+
 * Wed Feb 07 2018 Fedora Release Engineering <releng@fedoraproject.org> - 3.27.4-2
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild