LOS ANGELES (Reuters) – Rapper Chris Brown scored his second No. 1 debut with new album "Fortune" topping the Billboard 200 chart on Wednesday, despite failing to impress critics in early reviews last week. "Fortune" sold 134,000 copies in its first week, according to Nielsen SoundScan, a considerably lower debut than the singer's previous album "F.A.M.E.," which also reached No. 1 with 270,000 copies in its debut week last year. Brown's was the only new album in the top 10 this week. A surprise entry from pop star Katy Perry took the No. 2 slot on the album chart. …