[thci] fix `setBbrDataset` (#7455)
[thci] fix `setBbrDataset` (#7455)


openthread/openthread,jwhui/openthread,openthread/openthread,srickardti/openthread,openthread/openthread,abtink/openthread,abtink/openthread,jwhui/openthread,jwhui/openthread,srickardti/openthread,srickardti/openthread,jwhui/openthread,abtink/openthread,abtink/openthread,openthread/openthread,srickardti/openthread