client/network: Remove option to disable yamux flow control (#7358)

With the `OnRead` flow control option yamux "send[s] window updates only
when data is read on the receiving end" and not as soon as "a Stream's
receive window drops to 0".

Yamux flow control has proven itself. This commit removes the feature
flag. Yamux flow control is now always enabled.

substrate/client/cli/src/params/network_params.rs

@@ -92,11 +92,6 @@ pub struct NetworkParams {
 	#[structopt(flatten)]
 	pub node_key_params: NodeKeyParams,
 
-	/// Disable the yamux flow control. This option will be removed in the future once there is
-	/// enough confidence that this feature is properly working.
-	#[structopt(long)]
-	pub no_yamux_flow_control: bool,
-
 	/// Enable peer discovery on local networks.
 	///
 	/// By default this option is true for `--dev` and false otherwise.
@@ -158,7 +153,6 @@ impl NetworkParams {
 				enable_mdns: !is_dev && !self.no_mdns,
 				allow_private_ipv4: !self.no_private_ipv4,
 				wasm_external_transport: None,
-				use_yamux_flow_control: !self.no_yamux_flow_control,
 			},
 			max_parallel_downloads: self.max_parallel_downloads,
 			allow_non_globals_in_dht: self.discover_local || is_dev,