nixos/tests/hocker-fetchdocker: fix evaluation

it still does not build

+1 -1
+1 -1
pkgs/build-support/fetchdocker/credentials.nix
··· 32 32 let 33 33 pathParts = 34 34 (builtins.filter 35 - ({prefix}: "DOCKER_CREDENTIALS" == prefix) 35 + ({prefix, path}: "DOCKER_CREDENTIALS" == prefix) 36 36 builtins.nixPath); 37 37 in 38 38 if (pathParts != []) then (builtins.head pathParts).path else ""