zenmonitor: inherit meta.homepage from new src

[lordkekz]

I noticed that on https://search.nixos.org the package points to a github repo which is no longer available. This PR makes it so the meta.homepage attribute is inherited from the new src introduced by #338855. Hopefully this removes the need to manually update the homepage if upstream ever changes again.

New behavior:

nix-repl> outputs.legacyPackages.x86_64-linux.zenmonitor.meta.homepage
"https://git.exozy.me/a/zenmonitor3"

Sorry for pinging you with such a trivial PR, hope you don't mind :)
Maintainers @alexbakker @Artturin

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/)
• 24.11 Release Notes (or backporting 23.11 and 24.05 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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