operating-systems: buer: Remove guix-for-channels and fix guix-home-service configuration

operating-systems/buer.scm

@@ -199,7 +199,7 @@
           #|Home environment services|#
           (service guix-home-service-type
                    (if (file-exists? "/run/current-system/provenance") '()
-                     `(("radio" . ,home-environment:radio))))
+                     `(("radio" ,home-environment:radio))))
 
           #|Log services|#
           (service rottlog-service-type)
@@ -225,9 +225,6 @@
                    (guix-configuration
                     (build-accounts 16)
                     (discover? #t)
-                    (guix (guix-for-channels
-                            (list channel:guix
-                                  channel:radix)))
                     (authorized-keys
                      (cons* substitute-key:genenetwork.pub
                             %default-authorized-guix-keys))