added missing 'Apply' function for animation state (#2473)

Source/Urho3D/LuaScript/pkgs/Graphics/AnimationState.pkg

@@ -23,7 +23,8 @@ class AnimationState
     void AddTime(float delta);
     void SetLayer(unsigned char layer);
     void SetBlendMode(AnimationBlendMode mode);
-
+    void Apply();
+    
     Animation* GetAnimation() const;
     Bone* GetStartBone() const;
     float GetBoneWeight(const String name) const;