Fix set-pretty-symbols! with multiple modes

(set-pretty-symbols! '(c-mode c++-mode objc-mode) RULES*)

This fixes a logic bug that prevented RULES from applying to any but the
first mode in the list (e.g. only c-mode will be affected).

modules/ui/pretty-code/autoload.el

@@ -88,19 +88,18 @@ Pretty symbols can be unset for emacs-lisp-mode with:
 
   (set-pretty-symbols! 'emacs-lisp-mode nil)"
   (declare (indent defun))
-  (dolist (mode (doom-enlist modes))
   (if (null (car-safe rest))
       (delq (assq mode +pretty-code-symbols-alist)
             +pretty-code-symbols-alist)
     (let (results merge key)
       (while rest
-          (setq key (pop rest))
-          (pcase key
+        (pcase (setq key (pop rest))
           (:merge (setq merge (pop rest)))
           (:alist (setq results (append (pop rest) results)))
           (_
            (when-let* ((char (plist-get +pretty-code-symbols key)))
              (push (cons (pop rest) char) results)))))
+      (dolist (mode (doom-enlist modes))
         (unless merge
           (delq (assq mode +pretty-code-symbols-alist)
                 +pretty-code-symbols-alist))