ERIKAS MWISI KAMBALE  CONGOLESE police detained scores of protesters and fired live rounds yesterday to disperse crowds demanding the departure of the United Nations peacekeeping mission from the city of Beni, local authorities and witnesses said. Hundreds of young people have been protesting in several cities in eastern Democratic Republic of Congo since Monday, angry that the U.N. mission, known as MONUSCO, has failed to prevent a wave of civilian killings by armed groups. So far this year around 330 people have been killed in the violence, an unresolved legacy of a civil war that officially ended in 2003, according…