nixos-rebuild: print run-*-vm location with bootloader (#130385)

Previously when doing a nixos-rebuild build-vm we see a message saying how to
run the VM, but with nixos-rebuild build-vm-with-bootloader we did not. We
now show it in both cases.

pkgs/os-specific/linux/nixos-rebuild/nixos-rebuild.sh

···
 fi
 
 
-if [ "$action" = build-vm ]; then
+if [ "$action" = build-vm -o "$action" = build-vm-with-bootloader ]; then
     cat >&2 <<EOF
 
 Done.  The virtual machine can be started by running $(echo $pathToConfig/bin/run-*-vm)