fix: use form.confirmed (not .cancelled) in _process_cert

openvpncertupdate.py

@@ -793,7 +793,7 @@ class CursesApp:
     ) -> bool:
         """Form → generate → deliver. Returns False if user cancelled."""
         form = show_cert_form(stdscr, cn=cn, email=email, cn_readonly=is_renewal)
-        if form.cancelled:
+        if not form.confirmed:
             return False
 
         final_cn = form.cn