ox-texinfo: Fix 1efac41

* lisp/ox-texinfo.el (org-texinfo--get-node): Upcase property name.
  This is required since ae5932282d44742d932d40136edf441bc18609a9.

lisp/ox-texinfo.el

@@ -433,7 +433,7 @@ See `org-texinfo-text-markup-alist' for details."
 (defun org-texinfo--get-node (headline info)
   "Return node entry associated to HEADLINE.
 INFO is a plist used as a communication channel."
-  (let ((menu-title (org-element-property :texinfo-menu-title headline)))
+  (let ((menu-title (org-element-property :TEXINFO_MENU_TITLE headline)))
     (org-texinfo--sanitize-menu
      (replace-regexp-in-string
       "%" "%%"