[0174] Fixed MinLevel and requirments for quest 590
* Fixed MinLevel for quest 590 (A Rogue's Deal) and removing wrong requirement about killing involved NPC because this is handled by SD2 and not by DB
  Source: http://www.wowwiki.com/Quest:A_Rogue%27s_Deal_(2)?oldid=532871

Signed-off-by: cala <calaftp@free.fr>