pear-desktop: unify electron-builder logic

pkgs/by-name/pe/pear-desktop/package.nix

@@ -47,18 +47,17 @@ stdenv.mkDerivation (finalAttrs: {
 
   env.ELECTRON_SKIP_BINARY_DOWNLOAD = 1;
 
-  postBuild =
-    lib.optionalString stdenv.hostPlatform.isDarwin ''
-      cp -R ${electron.dist}/Electron.app Electron.app
-      chmod -R u+w Electron.app
-    ''
-    + ''
-      pnpm build
-      ./node_modules/.bin/electron-builder \
-        --dir \
-        -c.electronDist=${if stdenv.hostPlatform.isDarwin then "." else electron.dist} \
-        -c.electronVersion=${electron.version}
-    '';
+  postBuild = ''
+    pnpm build
+
+    cp -r ${electron.dist} electron-dist
+    chmod -R u+w electron-dist
+
+    ./node_modules/.bin/electron-builder \
+      --dir \
+      -c.electronDist=electron-dist \
+      -c.electronVersion=${electron.version}
+  '';
 
   desktopItems = [
     (makeDesktopItem {