paperless: use `imagemagickBig`
paperless: use `imagemagickBig`

`imagemagickBig` has `gs` support. This fixes a warning during
thumbnail generation (`convert: no images defined`).
The type of thumbnails that are generated is unchanged.

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