Revert "basichost: prevent duplicate dials (libp2p#2196)"

This reverts commit 0d7e852.

p2p/host/basic/basic_host.go

@@ -640,13 +640,8 @@ func (h *BasicHost) NewStream(ctx context.Context, p peer.ID, pids ...protocol.I
 		}
 	}
 
-	s, err := h.Network().NewStream(network.WithNoDial(ctx, "already dialed"), p)
+	s, err := h.Network().NewStream(ctx, p)
 	if err != nil {
-		// TODO: It would be nicer to get the actual error from the swarm,
-		// but this will require some more work.
-		if errors.Is(err, network.ErrNoConn) {
-			return nil, errors.New("connection failed")
-		}
 		return nil, err
 	}