tests.fetchurl: remove alias usage

{ invalidateFetcherByDrvHash, fetchurl, jq, moreutils, ... }: {

{ testers, fetchurl, jq, moreutils, ... }: {

  # Tests that we can send custom headers with spaces in them

  header =

    let headerValue = "Test '\" <- These are some quotes";

    in invalidateFetcherByDrvHash fetchurl {

    in testers.invalidateFetcherByDrvHash fetchurl {

      url = "https://httpbin.org/headers";

      sha256 = builtins.hashString "sha256" (headerValue + "\n");

      curlOptsList = [ "-H" "Hello: ${headerValue}" ];