message: Fix rename window handler to mark action as handled
  ## PR Checklist
  * [x] Closes
  * [x] CLA signed.
  * [ ] Tests added/passed
  * [ ] Documentation updated.
  * [ ] Schema updated.
  * [ ] I've discussed this with core contributors already.
diff: @@ -719,9 +719,9 @@ namespace winrt::TerminalApp::implementation
  const auto newName = realArgs.Name();
  const auto request = winrt::make_self<implementation::RenameWindowRequestedArgs>(newName);
  _RenameWindowRequestedHandlers(*this, *request);
  + args.Handled(true);
  }
  }
  - args.Handled(false);
  }
  void TerminalPage::_HandleOpenWindowRenamer(const IInspectable& /*sender*/,
  