nixos/x11/hardware/libinput: enable by default

Basically everything Wayland uses this, it's much more actively
maintained than xf86-input-evdev, and we should really be shipping
it by default.

nixos/doc/manual/release-notes/rl-2305.section.md

@@ -265,6 +265,8 @@ In addition to numerous new and upgraded packages, this release has the followin
 
 - [services.xserver.videoDrivers](options.html#opt-services.xserver.videoDrivers) now defaults to the `modesetting` driver over device-specific ones. The `radeon`, `amdgpu` and `nouveau` drivers are still available, but effectively unmaintained and not recommended for use.
 
+- [services.xserver.libinput.enable](options.html#opt-services.xserver.libinput.enable) is now set by default, enabling the more actively maintained and consistently behaved input device driver.
+
 - To enable the HTTP3 (QUIC) protocol for a nginx virtual host, set the `quic` attribute on it to true, e.g. `services.nginx.virtualHosts.<name>.quic = true;`.
 
 - In `services.fail2ban`, `bantime-increment.<name>` options now default to `null` (except `bantime-increment.enable`) and are used to set the corresponding option in `jail.local` only if not `null`. Also, enforce that `bantime-increment.formula` and `bantime-increment.multipliers` are not both specified.

nixos/modules/services/x11/hardware/libinput.nix

@@ -260,7 +260,9 @@ in {
   options = {
 
     services.xserver.libinput = {
-      enable = mkEnableOption (lib.mdDoc "libinput");
+      enable = mkEnableOption (lib.mdDoc "libinput") // {
+        default = true;
+      };
       mouse = mkConfigForDevice "mouse";
       touchpad = mkConfigForDevice "touchpad";
     };