Core/Auras: fixed EquippedItemClass check

follow-up to 29c3b7d8f60c18e52ec22fec6de9abc3dc468166

src/server/game/Spells/Auras/SpellAuras.cpp

@@ -1801,7 +1801,7 @@ uint8 Aura::GetProcEffectMask(AuraApplication* aurApp, ProcEventInfo& eventInfo,
     // do that only for passive spells
     /// @todo this needs to be unified for all kinds of auras
     Unit* target = aurApp->GetTarget();
-    if (IsPassive() && target->GetTypeId() == TYPEID_PLAYER)
+    if (IsPassive() && target->GetTypeId() == TYPEID_PLAYER && GetSpellInfo()->EquippedItemClass != -1)
     {
         if (!GetSpellInfo()->HasAttribute(SPELL_ATTR3_IGNORE_PROC_SUBCLASS_MASK))
         {