Add 'mas' to Homebrew configuration in aarch64-darwin

This commit updates the default Homebrew configuration to include 'mas' alongside 'libusb' for the aarch64-darwin system. It also introduces an empty 'masApps' array for potential future use.

modules/darwin/system/homebrew/default.nix

@@ -1,4 +1,9 @@
-{ lib, config, inputs, ... }:
+{
+  lib,
+  config,
+  inputs,
+  ...
+}:
 
 with lib;
 with lib.metacfg;

systems/aarch64-darwin/m4/default.nix

@@ -5,7 +5,11 @@ with lib.metacfg;
 
   homebrew = {
     enable = true;
-    brews = [ "libusb"];
+    brews = [
+      "libusb"
+      "mas"
+    ];
+    masApps = [ ];
   };
 
   metacfg = {