The Brooklyn man killed in a moped crash early Christmas morning bought the same two-wheeler just days earlier, a purchase his devastated mother advised against. “Christmas is ruined for me,” Saquan Smith’s mother, Valerie Smith, told the Daily News on Wednesday. “I lost my baby. It’s never going to be the same again.” Saquan Smith, 30, was riding his brand new gas-powered moped on Linden ...