Load core-os sooner & in all sessions

Indirectly fixes set-env! errors when using it from your init files.

core/core.el

@@ -342,10 +342,10 @@ to least)."
                 noninteractive)
       (user-error "Your package autoloads are missing! Run `bin/doom refresh' to regenerate them")))
   ;; Initialize Doom core
+  (require 'core-os)
   (unless noninteractive
     (add-hook! 'emacs-startup-hook
       #'(doom|post-init doom|display-benchmark))
-    (require 'core-os)
     (require 'core-ui)
     (require 'core-editor)
     (require 'core-projects)