Revert "knot-resolver: temporarily make it pass"

This reverts commit 4cad0502db.

The underlying issue has been fixed in
https://github.com/NixOS/nixpkgs/pull/300905/files, this workaround is
not needed anymore.

pkgs/servers/dns/knot-resolver/default.nix

@@ -53,8 +53,6 @@ unwrapped = stdenv.mkDerivation rec {
     echo 'os.exit(77)' > daemon/lua/trust_anchors.test/bootstrap.test.lua
     sed -E '/^[[:blank:]]*test_(dstaddr|headers),?$/d' -i \
       tests/config/doh2.test.lua modules/http/http_doh.test.lua
-  '' + /* FIXME: see PR #286822 */ ''
-    sed '/doh2\.test\.lua/d' -i tests/config/meson.build
   '';
 
   preConfigure = ''
@@ -120,7 +118,6 @@ wrapped-full = runCommand unwrapped.name
     allowSubstitutes = false;
     inherit (unwrapped) meta;
   }
-  assert false; # FIXME: the http module won't work; see PR #286822
   (''
     mkdir -p "$out"/bin
     makeWrapper '${unwrapped}/bin/kresd' "$out"/bin/kresd \