fix recording start stop

Signed-off-by: 21pages <pages21@163.com>

flutter/lib/desktop/pages/remote_page.dart

@@ -118,6 +118,7 @@ class _RemotePageState extends State<RemotePage>
   void dispose() {
     debugPrint("REMOTE PAGE dispose ${widget.id}");
     _ffi.dialogManager.hideMobileActionsOverlay();
+    _ffi.recordingModel.onClose();
     _rawKeyFocusNode.dispose();
     _ffi.close();
     _timer?.cancel();