nixos/kmonad: remove unnecessary cli flag --input

input has already been set in the config file.

nixos/modules/services/hardware/kmonad.nix

@@ -122,8 +122,6 @@ let
       cmd =
         [
           (lib.getExe cfg.package)
-          "--input"
-          ''device-file "${keyboard.device}"''
         ]
         ++ cfg.extraArgs
         ++ [ "${mkCfg keyboard}" ];