n-api: remove experimental gate from status codes

Re: #21226 (comment)
PR-URL: #21680
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Gus Caplan <me@gus.host>

Author: Gabriel Schulhof

src/node_api_types.h

@@ -76,10 +76,8 @@ typedef enum {
   napi_escape_called_twice,
   napi_handle_scope_mismatch,
   napi_callback_scope_mismatch,
-#ifdef NAPI_EXPERIMENTAL
   napi_queue_full,
   napi_closing,
-#endif  // NAPI_EXPERIMENTAL
 } napi_status;
 
 #ifdef NAPI_EXPERIMENTAL