made leyla configs optional

configurations/nixos/emergent/nvidia-drivers.nix

@@ -1,6 +1,9 @@
-{ config, lib, pkgs, ... }:
 {
-
+  config,
+  lib,
+  pkgs,
+  ...
+}: {
   # Enable OpenGL
   hardware.graphics = {
     enable = true;
@@ -10,13 +13,12 @@
   services.xserver.videoDrivers = ["nvidia"];
 
   hardware.nvidia = {
-
     # Modesetting is required.
     modesetting.enable = true;
 
     # Nvidia power management. Experimental, and can cause sleep/suspend to fail.
     # Enable this if you have graphical corruption issues or application crashes after waking
-    # up from sleep. This fixes it by saving the entire VRAM memory to /tmp/ instead 
+    # up from sleep. This fixes it by saving the entire VRAM memory to /tmp/ instead
     # of just the bare essentials.
     powerManagement.enable = false;
 
@@ -26,17 +28,17 @@
 
     # Use the NVidia open source kernel module (not to be confused with the
     # independent third-party "nouveau" open source driver).
-    # Support is limited to the Turing and later architectures. Full list of 
-    # supported GPUs is at: 
-    # https://github.com/NVIDIA/open-gpu-kernel-modules#compatible-gpus 
+    # Support is limited to the Turing and later architectures. Full list of
+    # supported GPUs is at:
+    # https://github.com/NVIDIA/open-gpu-kernel-modules#compatible-gpus
     # Only available from driver 515.43.04+
     open = false;
 
     # Enable the Nvidia settings menu,
-	# accessible via `nvidia-settings`.
+    # accessible via `nvidia-settings`.
     nvidiaSettings = true;
 
     # Optionally, you may need to select the appropriate driver version for your specific GPU.
     package = config.boot.kernelPackages.nvidiaPackages.stable;
   };
- }
+}