fix (core) Script Names not loaded with manual add (#11102)

This fixes Script names not being loaded with npcs and gameobjects when manually added with the .npc\gameobject add cmd that would lead the user to restart the server to load up the npc\gameobject with the script that was manually added

src/server/game/Entities/Creature/Creature.cpp

@@ -2837,7 +2837,8 @@ std::string Creature::GetScriptName() const
 uint32 Creature::GetScriptId() const
 {
     if (CreatureData const* creatureData = GetCreatureData())
-        return creatureData->ScriptId;
+        if (uint32 scriptId = creatureData->ScriptId)
+            return scriptId;
 
     return sObjectMgr->GetCreatureTemplate(GetEntry())->ScriptID;
 }

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

@@ -2141,7 +2141,8 @@ void GameObject::EventInform(uint32 eventId)
 uint32 GameObject::GetScriptId() const
 {
     if (GameObjectData const* gameObjectData = GetGOData())
-        return gameObjectData->ScriptId;
+        if (uint32 scriptId = gameObjectData->ScriptId)
+            return scriptId;
 
     return GetGOInfo()->ScriptId;
 }