message: Fix the `wt` action in defterm windows
  This is a pretty obvious typo in retrospect. Never hit it before, because in all non-defterm windows, the `_startupActions` always has one action.
  * [x] Closes
diff: @@ -556,7 +556,7 @@ namespace winrt::TerminalApp::implementation
  auto actions = winrt::single_threaded_vector<ActionAndArgs>(std::move(
  TerminalPage::ConvertExecuteCommandlineToActions(realArgs)));
  - if (_startupActions.Size() != 0)
  + if (actions.Size() != 0)
  {
  actionArgs.Handled(true);
  ProcessStartupActions(actions, false);
  