desktop, proxmox-lvm-minimal: Remove nss-certs its now in %base-packages

* .guix/rekahsoft/guix-config/vms/guix-ci0-home-rekahsoft-ca.scm: use-substitutes? was
removed upstream; see https://git.savannah.gnu.org/cgit/guix.git/commit/?id=7d9ad8f3a695b6d813f484625681263f4509f181

.guix/rekahsoft/guix-config/desktop.scm

@@ -156,7 +156,6 @@
              "soapyhackrf"    ;; SoapySDR library support for the hackrf one
              "lvm2"           ;; for lvm2 tools
              "nix"
-             "nss-certs"      ;; for HTTPS access
              "recutils"
              "tmux"))
       %base-packages))

.guix/rekahsoft/guix-config/proxmox-vm-lvm-minimal.scm

@@ -156,8 +156,7 @@ mail.*                                 -/var/log/maillog
    (packages
     (append
      (map specification->package
-          '("nss-certs"
-            "recutils"
+          '("recutils"
             "openssh"
             "tmux"
             "emacs"

.guix/rekahsoft/guix-config/vms/guix-ci0-home-rekahsoft-ca.scm

@@ -296,8 +296,7 @@ PUBLISH-URL."
      (list (service cuirass-service-type
             (cuirass-configuration
              (host "localhost")
-             (specifications %cuirass-specs)
-             (use-substitutes? #t)))
+             (specifications %cuirass-specs)))
 
            %nginx-cache-activation