fix itest re `blockbeat` #494

Job	Run time
cross compilation	32m 49s
check commits	59m 55s
lint code	7m 36s
check pinned dependencies (google.golang.org/grpc v1.59.0)	4s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	3s
run macOS itest	1h 1m 52s
check release notes updated	8s
RPC and mobile compilation check	2m 48s
sample configuration check	52s
Sqlc check	30s
run ubuntu itests (btcd, backend=btcd cover=1)	45m 11s
run unit tests (btcd unit-cover)	16m 56s
run ubuntu itests (bitcoind, backend=bitcoind cover=1)	51m 32s
run windows itest	5m 8s
run unit tests (unit tags="kvdb_etcd")	18m 12s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	50m 54s
run unit tests (unit tags="kvdb_postgres")	17m 20s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling" cover=1)	53m 20s
run unit tests (unit tags="kvdb_sqlite")	15m 38s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	1h 5m 58s
run unit tests (btcd unit-race)	35m 33s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	1h 19m 6s
run unit tests (unit-module)	1m 56s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	52m 36s
run ubuntu itests (bitcoind-postgres-nativesql, backend=bitcoind dbbackend=postgres nativesql=true)	1h 18m 49s
run ubuntu itests (bitcoind-sqlite-nativesql, backend=bitcoind dbbackend=sqlite nativesql=true)	52m 41s
run ubuntu itests (neutrino, backend=neutrino cover=1)	47m 16s
finish	5s
	14h 14m 48s

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