Fix batchopen fee calculation #14774

Job	Run time
RPC and mobile compilation check	5m 38s
check commits	5m 1s
Sqlc check	5m 7s
cross compilation	28m 21s
lint code	7m 32s
sample configuration check	3m 20s
run unit tests (btcd unit-cover)	9m 33s
run ubuntu itests (btcd, backend=btcd cover=1)	25m 17s
run ubuntu itests (bitcoind, backend=bitcoind cover=1)	31m 21s
run unit tests (unit tags="kvdb_etcd")	18m 35s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	31m 17s
run unit tests (unit tags="kvdb_postgres")	17m 49s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling" cover=1)	32m 20s
run unit tests (unit tags="kvdb_sqlite")	16m 13s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	41m 55s
run unit tests (btcd unit-race)	34m 29s
run unit tests (unit-module)	1m 29s
run windows itest	31m 40s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	57m 15s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	34m 23s
run macOS itest	40m 28s
check pinned dependencies (google.golang.org/grpc v1.59.0)	5s
run ubuntu itests (bitcoind-postgres-nativesql, backend=bitcoind dbbackend=postgres nativesql=true)	58m 12s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	6s
run ubuntu itests (bitcoind-sqlite-nativesql, backend=bitcoind dbbackend=sqlite nativesql=true)	33m 24s
run ubuntu itests (neutrino, backend=neutrino cover=1)	31m 41s
check release notes updated	3s
finish	3s
	10h 2m 37s

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