channel.nix: Fix broken flag to skip substitutes

Changed files
+1 -1
nixos
modules
installer
cd-dvd
+1 -1
nixos/modules/installer/cd-dvd/channel.nix
···
echo "unpacking the NixOS/Nixpkgs sources..."
mkdir -p /nix/var/nix/profiles/per-user/root
${config.nix.package}/bin/nix-env -p /nix/var/nix/profiles/per-user/root/channels \
-
-i ${channelSources} --quiet --option use-substitutes false
+
-i ${channelSources} --quiet --option build-use-substitutes false
mkdir -m 0700 -p /root/.nix-defexpr
ln -s /nix/var/nix/profiles/per-user/root/channels /root/.nix-defexpr/channels
mkdir -m 0755 -p /var/lib/nixos