fs: use Persistent::Reset() for resetting handles

PR-URL: nodejs#18650
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Kyle Farnung <kfarnung@microsoft.com>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

src/node_file.h

@@ -152,8 +152,8 @@ class FileHandle : public AsyncWrap {
     }
     ~CloseReq() {
       uv_fs_req_cleanup(req());
-      promise_.Empty();
-      ref_.Empty();
+      promise_.Reset();
+      ref_.Reset();
     }
 
     FileHandle* file_handle();