api.load_file: use internal fn to avoid caching
api.load_file: use internal fn to avoid caching

Fix #156

yagebu/fava,beancount/fava,beancount/fava,aumayr/beancount-web,aumayr/beancount-web,beancount/fava,yagebu/fava,beancount/fava,yagebu/fava,aumayr/beancount-web,aumayr/beancount-web,beancount/fava,yagebu/fava,yagebu/fava