routing: fix mc blinded path behaviour. #16883

Job	Run time
lint code	4m 52s
Sqlc check	52s
check pinned dependencies (google.golang.org/grpc v1.59.0)	3s
check commits	4m 52s
RPC and mobile compilation check	2m 35s
cross compilation	30m 19s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	3s
sample configuration check	1m 15s
run unit tests (btcd unit-cover)	19m 21s
run macOS itest	47m 56s
run unit tests (unit tags="kvdb_etcd")	20m 56s
run unit tests (unit tags="kvdb_postgres")	20m 17s
run windows itest	6m 47s
run unit tests (unit tags="kvdb_sqlite")	18m 20s
run unit tests (btcd unit-race)	40m 0s
run unit tests (unit-module)	1m 18s
check release notes updated	5s
run ubuntu itests (btcd, backend=btcd cover=1)	32m 33s
run ubuntu itests (bitcoind, backend=bitcoind cover=1)	40m 31s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	39m 28s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling" cover=1)	40m 44s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	52m 3s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	22m 18s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	41m 24s
run ubuntu itests (bitcoind-postgres-nativesql, backend=bitcoind dbbackend=postgres nativesql=true)	1h 3m 45s
run ubuntu itests (bitcoind-sqlite-nativesql, backend=bitcoind dbbackend=sqlite nativesql=true)	39m 55s
run ubuntu itests (neutrino, backend=neutrino cover=1)	36m 58s
finish	7s
	10h 29m 37s

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