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

modules/editor/snippets/autoload/settings.el

@@ -4,7 +4,7 @@
 (defun set-yas-minor-mode! (modes)
   "Register minor MODES (one mode symbol or a list of them) with yasnippet so it
 can have its own snippets category, if the folder exists."
-  (dolist (mode (doom-enlist modes))
+  (dolist (mode (ensure-list modes))
     (let ((fn (intern (format "+snippets-register-%s-h" mode))))
       (fset fn (lambda () (yas-activate-extra-mode mode)))
       (add-hook (intern (format "%s-hook" mode)) fn))))