prevent double declicks (click after RecStop)

prevent double declicks (click after RecStop)

If there's port-latency > period-size, there is a
split cycle with (this_event->action_frame - _transport_frame).
Yet Session::check_declick_out() keeps PendingDeclickOut if
StopPendingCapture is set. The route declick’ed twice:
Once with the period-size and one with the remaining frames,
which resulted in a click.