polkadot: remove grandpa pause support (#2511)

This was never used and we probably don't need it anyway.

polkadot/cli/src/command.rs

@@ -215,12 +215,6 @@ where
 
 	set_default_ss58_version(chain_spec);
 
-	let grandpa_pause = if cli.run.grandpa_pause.is_empty() {
-		None
-	} else {
-		Some((cli.run.grandpa_pause[0], cli.run.grandpa_pause[1]))
-	};
-
 	if chain_spec.is_kusama() {
 		info!("----------------------------");
 		info!("This chain is not in any way");
@@ -257,7 +251,6 @@ where
 			config,
 			service::NewFullParams {
 				is_parachain_node: service::IsParachainNode::No,
-				grandpa_pause,
 				enable_beefy,
 				force_authoring_backoff: cli.run.force_authoring_backoff,
 				jaeger_agent,