org-export: Fix commit 468d86052805e3d1438ae4a0487b4f197e572b82

* contrib/lisp/org-export.el (org-export-dispatch-ui): Ensure fitting
  happens once contents have been inserted in the displayed buffer.

contrib/lisp/org-export.el

@@ -4591,13 +4591,13 @@ back to standard interface."
 	(delete-other-windows)
 	(org-switch-to-buffer-other-window
 	 (get-buffer-create "*Org Export Dispatcher*"))
-	(org-fit-window-to-buffer)
 	(setq cursor-type nil))
       ;; At this point, the buffer containing the menu exists and is
       ;; visible in the current window.  So, refresh it.
       (with-current-buffer "*Org Export Dispatcher*"
 	(erase-buffer)
 	(insert help))
+      (org-fit-window-to-buffer)
       (org-export-dispatch-action
        standard-prompt allowed-keys backends options first-key expertp))))