nixos: services.xserver.desktopManager.xterm.enable: fix type

Changed files
+1
nixos
modules
services
x11
desktop-managers
+1
nixos/modules/services/x11/desktop-managers/xterm.nix
···
options = {
services.xserver.desktopManager.xterm.enable = mkOption {
+
type = types.bool;
default = true;
description = "Enable a xterm terminal as a desktop manager.";
};