Revert "python.pipInstallHook: avoid producing wrong direct_url.json file"

Certain packages were failing since this was merged.
https://github.com/NixOS/nixpkgs/pull/229472#issuecomment-1544410416

This reverts commit bff6c67911.

pkgs/development/interpreters/python/hooks/pip-install-hook.sh

@@ -10,7 +10,9 @@ pipInstallPhase() {
     mkdir -p "$out/@pythonSitePackages@"
     export PYTHONPATH="$out/@pythonSitePackages@:$PYTHONPATH"
 
-    @pythonInterpreter@ -m pip install $pname --find-links dist --no-index --no-warn-script-location --prefix="$out" --no-cache $pipInstallFlags
+    pushd dist || return 1
+    @pythonInterpreter@ -m pip install ./*.whl --no-index --no-warn-script-location --prefix="$out" --no-cache $pipInstallFlags
+    popd || return 1
 
     runHook postInstall
     echo "Finished executing pipInstallPhase"