vimPlugins.copilot-vim: fix meta attrs

[GaetanLepage]

Description of changes

This override was not recursive and thus vimPlugins.copilot-vim.meta.homepage didn't exist.

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
• [x] 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
• [x] Fits CONTRIBUTING.md.

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[GaetanLepage]

Introduced in https://github.com/NixOS/nixpkgs/pull/279864

[GaetanLepage]

Result of nixpkgs-review pr 320699 run on aarch64-darwin 1

[GaetanLepage]

Result of nixpkgs-review pr 320699 run on x86_64-darwin 1

[GaetanLepage]

Result of nixpkgs-review pr 320699 run on x86_64-linux 1

[GaetanLepage]

Result of nixpkgs-review pr 320699 run on aarch64-linux 1

[github-actions[bot]]

Successfully created backport PR for staging-24.05:

• 320719

[github-actions[bot]]

Successfully created backport PR for release-24.05:

• 320720