Inconsistent "immediate" value in JSON document

[64kramsystem]

(this is not the same as #9; that is about the semantic, while this is about consistency)

The value of the "immediate" field is inconsistent in at least one case.

The instruction LD B, d8 has both operands with values immediate = true. This is a mistake, as the first operand is not an immediate, regardless of the semantics of the immediate field.