updated proxmox disko configuration

modules/hardware-configuration/vm/proxmox.nix

@@ -12,7 +12,7 @@
   boot.initrd.kernelModules = [ ];
   boot.kernelModules = [ ];
   boot.extraModulePackages = [ ];
-  boot.loader.grub.device = "/dev/sda"; # or "nodev" for efi only
+  boot.loader.grub.device = "/dev/sda2"; # or "nodev" for efi only
 
   # fileSystems."/" =
   #   { device = "/dev/disk/by-label/nixos";