By Martin Coulter LONDON (Reuters) -Payments firm Wise became the biggest European company to reveal it held funds in Silicon Valley Bank on Sunday, but a spokesperson said the firm faced "minimal exposure". SVB Financial Group, which focuses on tech startups, became the biggest bank collapse since the 2008 financial crisis, rocking global markets, sending stocks tumbling and leaving tech founders uncertain that they would be able to pay their staff. London-based Wise, formerly known as...