NEW YORK — A man accused of fatally shooting hip-hop icon Jam Master Jay bragged that he wanted to “kill him again” about two years after the murder, the suspect’s former roommate testified Monday. Witness Cherubin Bastien, 65, told a federal jury he moved in with accused killer Karl Jordan Jr. in 2004, renting a room at Jordan’s father’s house in Queens for about $300 a month. The murder of Jam Master Jay, real name Jason Mizell, came up in conversation twice during the nine months Bastien and Jordan lived together. Jordan, who goes by the nickname “Little D,” and Ronald “Tinard” Washington, …