fix(Core/Auras): SPELL_AURA_MOD_SCALE should scale additively instead… (#14425)

...multiplicatively

Co-authored-by: Shauren <shauren.trinity@gmail.com>

src/server/game/Entities/Pet/Pet.h

@@ -45,6 +45,7 @@ public:
     void AddToWorld() override;
     void RemoveFromWorld() override;
 
+    float GetNativeObjectScale() const override;
     void SetDisplayId(uint32 modelId) override;
 
     PetType getPetType() const { return m_petType; }