remove unnecessary consts (#1586)

bridges/relays/bin-substrate/src/cli/chain_schema.rs

@@ -115,7 +115,7 @@ macro_rules! declare_chain_connection_params_cli_schema {
 				) -> anyhow::Result<relay_substrate_client::Client<Chain>> {
 					let chain_runtime_version = self
 						.[<$chain_prefix _runtime_version>]
-						.into_runtime_version(Some(Chain::RUNTIME_VERSION))?;
+						.into_runtime_version(Chain::RUNTIME_VERSION)?;
 					Ok(relay_substrate_client::Client::new(relay_substrate_client::ConnectionParams {
 						host: self.[<$chain_prefix _host>],
 						port: self.[<$chain_prefix _port>],

bridges/relays/bin-substrate/src/cli/mod.rs

@@ -163,7 +163,9 @@ impl Balance {
 /// Used to abstract away CLI commands.
 pub trait CliChain: relay_substrate_client::Chain {
 	/// Current version of the chain runtime, known to relay.
-	const RUNTIME_VERSION: sp_version::RuntimeVersion;
+	///
+	/// can be `None` if relay is not going to submit transactions to that chain.
+	const RUNTIME_VERSION: Option<sp_version::RuntimeVersion>;
 
 	/// Crypto KeyPair type used to send messages.
 	///