Remove superfluous set_leader() usage

tests/cluster_info.rs

@@ -38,7 +38,6 @@ fn run_simulation(num_nodes: u64, fanout: usize, hood_size: usize) {
     // describe the leader
     let leader_info = ContactInfo::new_localhost(Keypair::new().pubkey(), 0);
     let mut cluster_info = ClusterInfo::new_with_invalid_keypair(leader_info.clone());
-    cluster_info.set_leader(leader_info.id);
 
     // setup stakes
     let mut stakes = HashMap::new();