Core/GameObject: use a friendly trigger for positive spells.

Fixes an issue with Skadi Harpoons.

Note to self: should actually implement GameObject casting already :/

src/server/game/Entities/GameObject/GameObject.cpp

@@ -1900,7 +1900,7 @@ void GameObject::CastSpell(Unit* target, uint32 spellId, TriggerCastFlags trigge
     }
     else
     {
-        trigger->setFaction(14);
+        trigger->setFaction(spellInfo->IsPositive() ? 35 : 14);
         // Set owner guid for target if no owner available - needed by trigger auras
         // - trigger gets despawned and there's no caster avalible (see AuraEffect::TriggerSpell())
         trigger->CastSpell(target ? target : trigger, spellInfo, triggered, nullptr, nullptr, target ? target->GetGUID() : ObjectGuid::Empty);