LONDON (Reuters) – Britain is falling behind its peers in the race to spur economic growth and Prime Minister Rishi Sunak must act now to boost investment, fix a lack of workers and avoid chaos over post-Brexit rules, the head of an employers group said on Monday. Confederation of British Industry Director-General Tony Danker praised Sunak for defusing the mini-budget crisis of former leader Liz Truss last year but said he was not matching the growth reforms of the United States and the European Union. Other countries were ahead of Britain in rolling out green investments in areas such as heat…