Thousands of angry protesters took to the streets to tell India’s leader he was unwelcome in Kolkata on Saturday, in the latest rally against a citizenship law that critics say discriminates against Muslims.Widespread street demonstrations, and occasionally deadly clashes, have gripped the Hindu-majority nation since the law was approved by parliament last month.Police said nearly 30,000 protesters took to the streets of Kolkata to denounce Prime Minister Narendra Modi’s visit, with many…