Fix #1127: errant entry in org-structure-template-alist

Caused an error when org-insert-structure-template is called in
org-mode.

modules/lang/org/+present.el

@@ -11,6 +11,10 @@
 
 (def-package! ox-reveal
   :defer t
+  :init
+  ;; Fix #1127, where ox-reveal adds an errant entry to
+  ;; `org-structure-template-alist'
+  (setq org-reveal-note-key-char nil)
   :config
   (setq org-reveal-root "https://cdn.jsdelivr.net/npm/reveal.js@3/"
         org-reveal-mathjax t))