Apply OS env overrides twice
Apply OS env overrides twice

The recent fix for #8346 had an unfortunate side-effect, as it prevented overrides of config options used in the module collector, e.g. `HUGO_MODULE_REPLACEMENTS`.

This commit fixes that by applying the overrides twice.

anthonyfok/hugo,gohugoio/hugo,gohugoio/hugo,anthonyfok/hugo,gohugoio/hugo,anthonyfok/hugo