fix(guix-daemon): default to no substitutes

Author: vxtls

steps-guix/improve/guix-daemon-and-pull.sh

@@ -221,6 +221,7 @@ done
 if [ ! -S "${daemon_socket}" ]; then
     guix-daemon \
         --build-users-group=guixbuild \
+        --no-substitutes \
         --listen="${daemon_socket}" \
         >/tmp/guix-daemon.log 2>&1 &
 fi