[Reg 0.4x -> 0.50] MsgStoreCode with instantiate_permission set not working with Amino JSON since Cosmos SDK 0.50 (wasmd 0.50)

After a series of changes, we got Amino JSON bach to pre-Cosmos SDK 0.50 behavior for the majority of CosmWasm message types. However, there is one case left we currently know about.

MsgStoreCode works when `instantiate_permission` is unset. When it is set to the following value, it fails:

```ts
const instantiatePermission: AccessConfig = {
permission: AccessType.ACCESS_TYPE_EVERYBODY,
address: "",
addresses: [],
};
const { codeId, checksum, originalSize, compressedSize } = await client.upload(
alice.address0,
wasm,
defaultUploadFee,
"test memo",
instantiatePermission,
);
```

The reason might be the JSON serialization of the empty list. But this is just an unevaluated guess.