fixed an error in use smartbft #3739

Job	Run time
Basic Checks	1m 11s
Unit Tests	9m 1s
Integration Tests (raft)	12m 35s
Integration Tests (pvtdata)	11m 49s
Integration Tests (pvtdatapurge e2e)	10m 41s
Integration Tests (ledger)	13m 3s
Integration Tests (lifecycle)	6m 7s
Integration Tests (smartbft)	19m 58s
Integration Tests (discovery gossip devmode pluggable)	6m 2s
Integration Tests (gateway idemix pkcs11 configtx configtxlator)	18m 11s
Integration Tests (sbe nwo msp)	7m 30s
	1h 56m 8s

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