refactor(nix): Use nixpkgs' vesktop now that it supports darwin

nix/overlays/darwin/vesktop.nix

@@ -1,35 +0,0 @@
-# REF: https://github.com/bandithedoge/nixpkgs-firefox-darwin/blob/ceaca2359e5371ccef3f92a36baf7c438b354afb/overlay.nix
-final: prev:
-
-let
-  mkApp = import ../../lib/darwin/mkApp.nix;
-
-  appFileName = "Vesktop.app";
-  version = "1.5.3";
-in {
-  vesktop = mkApp {
-    inherit (final) stdenv undmg _7zz;
-
-    pname = "Vesktop";
-    inherit appFileName version;
-
-    src = final.fetchurl {
-      url = "https://github.com/Vencord/Vesktop/releases/download/v${version}/Vesktop-${version}-universal.dmg";
-      hash = "sha256-ceOUNHSOaEqCbzkM64RtUu0Yhrq4tThcXZTDd+OsEXI";
-    };
-
-    # Replace the icon with a much more low profile icon
-    # REF: https://github.com/Vencord/Vesktop/pull/865
-    configurePhase = ''
-      cp -f ${../../../include/vesktop/icon.icns} ${appFileName}/Contents/Resources/icon.icns
-    '';
-
-    meta = with final.lib; {
-      description = "An alternate client for Discord with Vencord built-in";
-      homepage = "https://github.com/Vencord/Vesktop";
-      license = licenses.gpl3Only;
-      platforms = platforms.darwin;
-      sourceProvenance = with sourceTypes; [ binaryNativeCode ];
-    };
-  };
-}

nix/overlays/vesktop.nix

@@ -0,0 +1,13 @@
+final: prev:
+
+{
+  # Replace the icon with a much more low profile icon
+  # REF: https://github.com/Vencord/Vesktop/pull/865
+  vesktop = prev.vesktop.overrideAttrs (old: {
+    preBuild =
+      old.preBuild
+      + ''
+        cp -f ${../../include/vesktop/icon.icns} build/icon.icns
+      '';
+  });
+}