Use RemoveAurasByType() and not RemoveAuraDueToSpell() to remove iterated spellauras of a type - DueTospell() expects singular spellID

Thanks to Azazel for the heads up

--HG--
branch : trunk

src/server/game/AI/ScriptedAI/ScriptedFollowerAI.cpp

@@ -102,7 +102,7 @@ void FollowerAI::MoveInLineOfSight(Unit* pWho)
             {
                 if (!me->getVictim())
                 {
-                    pWho->RemoveAurasDueToSpell(SPELL_AURA_MOD_STEALTH);
+                    pWho->RemoveAurasByType(SPELL_AURA_MOD_STEALTH);
                     AttackStart(pWho);
                 }
                 else if (me->GetMap()->IsDungeon())