Make axum-dual-protocol a non-feature. Fix build issues.

Signed-off-by: Jason Volk <jason@zemos.net>

src/core/config/mod.rs

@@ -368,8 +368,6 @@ pub struct TlsConfig {
 	pub key: String,
 	#[serde(default)]
 	/// Whether to listen and allow for HTTP and HTTPS connections (insecure!)
-	/// Only works / does something if the `axum_dual_protocol` feature flag was
-	/// built
 	pub dual_protocol: bool,
 }