fix unregister texture condition

Signed-off-by: dignow <linlong1265@gmail.com>

flutter/lib/desktop/pages/remote_page.dart

@@ -207,7 +207,7 @@ class _RemotePageState extends State<RemotePage>
     // https://github.com/flutter/flutter/issues/64935
     super.dispose();
     debugPrint("REMOTE PAGE dispose session $sessionId ${widget.id}");
-    await _renderTexture.destroy(widget.tabWindowId != null);
+    await _renderTexture.destroy(closeSession);
     // ensure we leave this session, this is a double check
     bind.sessionEnterOrLeave(sessionId: sessionId, enter: false);
     DesktopMultiWindow.removeListener(this);