nixos/nextcloud: Fix ambiguity in `objectstoreConfig` string
nixos/nextcloud: Fix ambiguity in `objectstoreConfig` string

Previously this was a little tricky to read and had the potential to
cause some ambiguity in string parsing.

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