fix: Fixed untagged enum deserialization issues

[Wicpar]

Fixes #167

There is maybe a better way to deserialize, but would not be as simple.

[MOZGIII]

This looks a bit off, let me take a stab at this

[MOZGIII]

Let's add the #[serde(untagged)] variant to the messages enum instead? https://serde.rs/variant-attrs.html#untagged

This should work for a generic "fallback" type.

[Wicpar]

I'm closing this as i no longer encounter the issues in the most recent version