Removes use of sc_client::Client from sc_consensus_babe (#5014)

* removes use of sc_client::Client from sc_consensus_babe

* Update client/consensus/babe/src/lib.rs

Co-authored-by: Benjamin Kampmann <ben.kampmann@googlemail.com>

substrate/client/consensus/babe/rpc/src/lib.rs

@@ -230,7 +230,6 @@ mod tests {
 			config.clone(),
 			client.clone(),
 			client.clone(),
-			client.clone(),
 		).expect("can initialize block-import");
 
 		let epoch_changes = link.epoch_changes().clone();