ST. JOHN’S, N.L.—The Supreme Court of Canada has refused a bid by the Roman Catholic archdiocese in St. John’s to appeal a ruling that found it liable for sexual abuse at the former Mount Cashel orphanage. Thursday’s court decision ends a legal battle that first shook Newfoundland and Labrador decades ago. It also determines once and for all that the church has a responsibility to the victims of the abuse that took place at the notorious former orphanage, at the hands of the Christian Brothers in the 1950s. Geoff Budden, the victims’ lawyer, said the archdiocese will have to pay about $2 million, divided among the four lead plaintiffs in the case. There are dozens more victims, Budden said in an interview Wednesday, adding that a process will be set up to determine how much they may be entitled to. St. John’s archdiocese issued a statement Thursday saying it will …