By Nia Williams (Reuters) -Oil prices fell by more than 2% on Tuesday as demand worries stemming from China’s prolonged COVID-19 lockdowns outweighed the prospect of a European embargo on Russian crude. Beijing is mass-testing residents to avert a lockdown similar to Shanghai’s over the past month. The capital’s restaurants were closed for dining in while some apartment blocks were sealed shut. Brent crude settled down $2.61, or 2.4%, at $104.97 a barrel. U.S. West Texas Intermediate (WTI) crude ended $2.76, or 2.6%, lower at $102.41. “There are real concerns about whether Chinese demand, whic…