init_iso20_SessionSetupReqType does not initialize all members

### Describe the bug

Code generated for these init structures is:

`
void init_iso20_SessionSetupReqType(struct iso20_SessionSetupReqType* SessionSetupReqType) {
(void) SessionSetupReqType;
}

void init_iso20_SessionSetupResType(struct iso20_SessionSetupResType* SessionSetupResType) {
(void) SessionSetupResType;
}`

Both contain arrays where their length is not set to zero.

### To Reproduce

See code generated in iso20_CommonMessages_Datatypes.c of AC DER branch of libcbv2g.

https://github.com/EVerest/libcbv2g/commit/723c024c418f92674c07092a5baa260fa60c03ec

### Anything else?

_No response_

Start by inspecting iso20_CommonMessages_Datatypes.c from the linked AC DER commit and trace the generated init functions back to cbExiGen's Python generator entry point. Regenerate the ISO 20 session setup types and verify that each array length is initialized to zero.

Written by the indexing model from the issue text.