Prototype LightDefinition listed `picture` as mandatory

[Muppet9010]

https://lua-api.factorio.com/latest/typ ... ition.html

The `picture` field is listed as mandatory, but it's optional for "basic" type. The `rotation_shift` field is the same requirement concept and is listed as optional.

[Bilka]

Thanks for the note, fixed for the next version. Note that picture is mandatory when the type is "oriented".