ZURICH (Reuters) – Swiss bank UBS posted on Tuesday a smaller-than-expected rise in second-quarter net profit as its investment banking and wealth management businesses struggled in tough market conditions. Profit in the three months ended June rose 5% to $2.1 billion. That compared with $2.0 billion a year earlier and lagged expectations for a 19.8% rise to $2.4 billion in a poll of 19 analysts compiled by the bank. UBS kicks off a round of earnings by major banks across Europe, where analysts are watching for signs that a weaker economy, higher interest rates and the war in Ukraine are weigh…