routing: fix mc blinded path behaviour. #16830

Job	Run time
Sqlc check	1m 54s
RPC and mobile compilation check	1m 56s
check commits	2m 6s
cross compilation	2m 8s
lint code	2m 7s
check pinned dependencies (google.golang.org/grpc v1.59.0)	4s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	5s
sample configuration check	2m 8s
run macOS itest	2m 12s
run unit tests (btcd unit-cover)	2m 5s
check release notes updated	3s
run unit tests (unit tags="kvdb_etcd")	2m 11s
run ubuntu itests (btcd, backend=btcd cover=1)	1s
run unit tests (unit tags="kvdb_postgres")	2m 7s
run windows itest	1m 57s
run ubuntu itests (bitcoind, backend=bitcoind cover=1)	2m 10s
run unit tests (unit tags="kvdb_sqlite")	2m 7s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	2m 6s
run unit tests (btcd unit-race)	2m 7s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling" cover=1)	1m 52s
run unit tests (unit-module)	1m 11s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	2m 6s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	1m 56s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	35s
run ubuntu itests (bitcoind-postgres-nativesql, backend=bitcoind dbbackend=postgres nativesql=true)	1m 58s
run ubuntu itests (bitcoind-sqlite-nativesql, backend=bitcoind dbbackend=sqlite nativesql=true)	1s
run ubuntu itests (neutrino, backend=neutrino cover=1)	1s
finish	3s
	41m 17s

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