*Fix a typo that makes no trigger can be summoned.

--HG--
branch : trunk

src/game/Object.cpp

@@ -1587,7 +1587,7 @@ GameObject* WorldObject::SummonGameObject(uint32 entry, float x, float y, float
 Creature* WorldObject::SummonTrigger(float x, float y, float z, float ang, uint32 duration, CreatureAI* (*GetAI)(Creature*))
 {
     TempSummonType summonType = (duration == 0) ? TEMPSUMMON_DEAD_DESPAWN : TEMPSUMMON_TIMED_DESPAWN;
-    Creature* summon = SummonCreature(WORLD_TRIGGER, x, y, z, ang, summonType, 0);
+    Creature* summon = SummonCreature(WORLD_TRIGGER, x, y, z, ang, summonType, duration);
     if(!summon)
         return NULL;