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/emacs/electric/autoload.el

@@ -9,7 +9,7 @@ Enables `electric-indent-local-mode' in MODES.
 
 \(fn MODES &key WORDS CHARS)"
   (declare (indent defun))
-  (dolist (mode (doom-enlist modes))
+  (dolist (mode (ensure-list modes))
     (let ((hook (intern (format "%s-hook" mode)))
           (fn   (intern (format "+electric--init-%s-h" mode))))
       (cond ((null (car-safe plist))