Script/ICC: Fix phase check in Saurfang script

Related to changes in dbecf05e39

src/server/scripts/Northrend/IcecrownCitadel/boss_deathbringer_saurfang.cpp

@@ -422,7 +422,7 @@ class boss_deathbringer_saurfang : public CreatureScript
 
             void UpdateAI(uint32 const diff)
             {
-                if ((!UpdateVictim() && !events.IsInPhase(PHASE_INTRO_A)) || events.IsInPhase(PHASE_INTRO_H))
+                if (!UpdateVictim() && (!events.IsInPhase(PHASE_INTRO_A) || events.IsInPhase(PHASE_INTRO_H)))
                     return;
 
                 events.Update(diff);