volume: vacuum pass preallocate variable

weed/topology/topology_vacuum.go

@@ -67,6 +67,7 @@ func batchVacuumVolumeCompact(grpcDialOption grpc.DialOption, vl *VolumeLayout,
 			err := operation.WithVolumeServerClient(url, grpcDialOption, func(volumeServerClient volume_server_pb.VolumeServerClient) error {
 				_, err := volumeServerClient.VacuumVolumeCompact(context.Background(), &volume_server_pb.VacuumVolumeCompactRequest{
 					VolumeId:    uint32(vid),
+					Preallocate: preallocate,
 				})
 				return err
 			})