Fix reference in remove_queue

    if not get_queue_by_id(qid):

        return

    log.info(f'Deleting queue with id {qid}')

    QueueElement.delete().where(Queue.id == qid).execute()

    QueueElement.delete().where(QueueElement.queue == qid).execute()

    PrinterQueue.delete().where(PrinterQueue.queue == qid).execute()

    Queue.delete().where(Queue.id == qid).execute()