KINSHASA (Reuters) – A top adviser to the Democratic Republic of Congo’s president Felix Tshisekedi has resigned after he was allegedly caught on tape negotiating a corrupt mineral deal, an allegation he denies. Tshisekedi took office in 2019 promising an end to the widespread corruption that blighted the reign of his predecessor Joseph Kabila. But several high-profile corruption scandals have since been reported in the minerals-rich country. The Organised Crime and Corruption Reporting Project (OCCRP), a nonprofit media organization, said Vidiye Tshimanga, the one-time spokesman for Tshiseked…