routing: fix stuck inflight payments #15016

Job	Run time
check commits	11m 8s
Sqlc check	3m 54s
cross compilation	14m 17s
check pinned dependencies (google.golang.org/grpc v1.59.0)	5s
lint code	7m 24s
RPC and mobile compilation check	5m 32s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	6s
sample configuration check	4m 16s
run unit tests (btcd unit-cover)	16m 40s
run macOS itest	43m 6s
check release notes updated	4s
run unit tests (unit tags="kvdb_etcd")	18m 36s
run ubuntu itests (btcd, backend=btcd cover=1)	27m 6s
run unit tests (unit tags="kvdb_postgres")	18m 9s
run ubuntu itests (bitcoind, backend=bitcoind cover=1)	33m 13s
run windows itest	46m 18s
run unit tests (unit tags="kvdb_sqlite")	16m 3s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	32m 49s
run unit tests (btcd unit-race)	35m 18s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling" cover=1)	34m 23s
run unit tests (unit-module)	1m 0s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	44m 6s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	1h 0m 53s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	35m 43s
run ubuntu itests (bitcoind-postgres-nativesql, backend=bitcoind dbbackend=postgres nativesql=true)	59m 7s
run ubuntu itests (bitcoind-sqlite-nativesql, backend=bitcoind dbbackend=sqlite nativesql=true)	36m 1s
run ubuntu itests (neutrino, backend=neutrino cover=1)	30m 57s
finish	3s
	10h 36m 17s

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