Powder snow does not use cube_all_inner_faces.json

Relates to MC-262692.

The bug

23w45a introduces the template model cube_all_inner_faces.json, used for hollow-looking blocks like spawners. It appears that powder snow has not been updated to use this model, meaning it instead continues to pointlessly define its own model, resulting in a much larger file size than is necessary.

How to fix

Make powder snow reference cube_all_inner_faces.json instead. An example of a fixed model file is attached.