refactor: adapt to cherry pick

Author: blaggacao

nix/kexec-installer/module.nix

@@ -13,7 +13,6 @@ in
     ../networkd.nix
     ../serial.nix
     ../restore-remote-access.nix
-    ../no-grub.nix
   ];
   options = {
     system.kexec-installer.name = lib.mkOption {

nix/netboot-installer/module.nix

@@ -6,7 +6,6 @@
     ../networkd.nix
     ../serial.nix
     ../restore-remote-access.nix
-    ../no-grub.nix
   ];
 
   # We are stateless, so just default to latest.