refactor: replace doom-enlist with ensure-list

doom-enlist is now a deprecated alias for ensure-list, which is built
into Emacs 28.1+ and is its drop-in replacement. We've already
backported it for 27.x users in doom-lib (in 4bf4978).

Ref: 4bf49785fd

lisp/lib/text.el

@@ -316,7 +316,7 @@ editorconfig or dtrt-indent installed."
            (editorconfig-set-indentation nil width)))
         ((require 'dtrt-indent nil t)
          (when-let (vars (nth 2 (assq major-mode dtrt-indent-hook-mapping-list)))
-           (dolist (var (doom-enlist vars))
+           (dolist (var (ensure-list vars))
              (doom-log "Updated %s = %d" var width)
              (set var width)))))
   (message "Changed indentation to %d" width))