chiaki: fix license information (GPLv3+ -> AGPLv3)
chiaki: fix license information (GPLv3+ -> AGPLv3)

This was changed by upstream in the 2.0 release and missed when we
update the nixpkgs package.

NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs