discord: add option to enable autoscrolling

[paaradiso]

Adds the option enableAutoscroll which enables middle-click autoscrolling.

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 25.05 Release Notes (or backporting 24.11 and 25.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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[drupol]

Hello,

Thanks for your first PR.

I added a comment, let me know if you need some help.

Moving this PR to draft, feel free to remove it from draft when you think it is ready to be reviewed again.

[drupol]

I don't think it should be done in here.

I may be wrong but if you really want to do something similar, you should wrap the binary using makeBinaryWrapper and add the option in there.

[paaradiso]

you're right, i moved it from makeDesktopItem to wrapProgramShell. i hope this is better :)