routing: fix mc blinded path behaviour. #16858

Job	Run time
cross compilation	51s
lint code	50s
check pinned dependencies (google.golang.org/grpc v1.59.0)	4s
check commits	1m 59s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	3s
run macOS itest	48s
check release notes updated	3s
RPC and mobile compilation check	1m 28s
sample configuration check	25s
Sqlc check	2m 40s
run ubuntu itests (btcd, backend=btcd cover=1)	48s
run unit tests (btcd unit-cover)	57s
run ubuntu itests (bitcoind, backend=bitcoind cover=1)	37s
run unit tests (unit tags="kvdb_etcd")	1m 2s
run windows itest	1m 32s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	37s
run unit tests (unit tags="kvdb_postgres")	48s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling" cover=1)	40s
run unit tests (unit tags="kvdb_sqlite")	1m 0s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	40s
run unit tests (btcd unit-race)	38s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	47s
run unit tests (unit-module)	1m 2s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	40s
run ubuntu itests (bitcoind-postgres-nativesql, backend=bitcoind dbbackend=postgres nativesql=true)	37s
run ubuntu itests (bitcoind-sqlite-nativesql, backend=bitcoind dbbackend=sqlite nativesql=true)	37s
run ubuntu itests (neutrino, backend=neutrino cover=1)	42s
finish	2s
	22m 57s

Provide feedback