Partly revert "Enable editable mode also for other sage packages"

This partly reverts commit b9b1dba.

build/pkgs/sagelib/spkg-install

@@ -49,7 +49,7 @@ if [ "$SAGE_EDITABLE" = yes ]; then
     # and renamed the distribution to "sagemath-standard").  There is no clean way to uninstall
     # them, so we just use rm.
     (cd "$SITEPACKAGESDIR" && rm -rf sage sage_setup sage-[1-9]*.egg-info sage-[1-9]*.dist-info)
-    time sdh_pip_editable_install . || exit 1
+    time python3 -m pip install --verbose --no-deps --no-index --no-build-isolation --isolated --editable . || exit 1
 else
     # Likewise, we should remove the egg-link that may have been installed previously.
     (cd "$SITEPACKAGESDIR" && rm -f sagemath-standard.egg-link)