nixos: use upstream xscreensaver module

nix/configurations/vanadium.nix

@@ -113,7 +113,6 @@ in
     ../nixosModules/common/network.nix
     ../nixosModules/common/sudo-conf.nix
     ../nixosModules/common/system-nixconf.nix
-    ../nixosModules/common/xscreensaver.nix
 
     # QUIRK:
     # Had issue when building the installer as it fails to bootstrap itself

nix/nixosModules/common/xscreensaver.nix

@@ -1,54 +0,0 @@
-#
-# This module provides a service react to xscreensaver events
-#
-{
-  config,
-  lib,
-  ...
-}:
-let
-  cfg = config.services.xscreensaver;
-in
-{
-  options = {
-    services.xscreensaver.hooks = lib.mkOption {
-      type = with lib.types; attrsOf str;
-      description = "An attrset of events mapped a block of shell command to be run";
-      default = { };
-    };
-  };
-
-  config = lib.mkIf cfg.enable {
-    systemd.user.services = {
-      "xscreensaver-hooks" = {
-        description = "Run commands on xscreensaver events";
-        after = [
-          "graphical-session.target"
-          "xscreensaver.service"
-        ];
-        partOf = [ "graphical-session.target" ];
-        wantedBy = [ "graphical-session.target" ];
-        script =
-          let
-            handlers = lib.concatMapAttrsStringSep "\n" (event: action: ''
-              "${event}")
-                      ( ${action}
-                      )
-                      ;;
-            '') cfg.hooks;
-          in
-          ''
-            xscreensaver-command -watch | while read event rest; do
-              echo "The handler script got \"$event\""
-              case $event in
-                ${handlers}
-              esac
-            done
-          '';
-        path = [
-          cfg.package # contains xscreensaver-command
-        ];
-      };
-    };
-  };
-}