Fix nested struct initialization
Fix nested struct initialization

The data is in VAL_STRUCT_DATA_BIN(val), not VAL_STRUCT_DATA(val)

Before this commit:

>> a: make struct! [ rebval [2] v struct! [rebval [3] nv int32 i] sv]
>> a/sv/nv
== []

After this commit:
>> a: make struct! [ rebval [2] v struct! [rebval [3] nv int32 i] sv]
>> a/sv/nv
== [unset! unset! unset!]

zsx/r3,zsx/r3,zsx/r3,zsx/r3