fix slow message wait index (#392) #366

Job	Run time
ci-lint	16s
build-2k	4m 18s
build-debug	4m 26s
build-forest	4m 13s
build-calibnet	4m 30s
build-mainnet	4m 19s
gen-check	9m 38s
gofmt	24s
lint	3m 26s
mod-tidy-check	38s
setup-params	5s
test (test-itest-curio, ./itests/curio_test.go)	7m 2s
test (test-all, `go list ./... \| grep -v curio/itests`)	3m 13s
test (test-itest-harmonyDB, ./itests/harmonydb_test.go)	3m 7s
test (test-itest-alertnow, ./itests/alertnow_test.go)	1m 54s
	51m 29s

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