fix: mark deal sealed in a DB transaction #516

Job	Run time
ci-lint	12s
build-debug	4m 23s
build-calibnet	4m 29s
build-forest	4m 39s
build-2k	4m 19s
build-mainnet	4m 30s
gen-check	9m 45s
lint	3m 24s
gofmt	18s
mod-tidy-check	41s
setup-params	5s
test (test-itest-curio, ./itests/curio_test.go)	7m 23s
test (test-all, `go list ./... \| grep -v curio/itests`)	3m 20s
test (test-itest-harmonyDB, ./itests/harmonydb_test.go)	2m 54s
test (test-itest-alertnow, ./itests/alertnow_test.go)	1m 44s
	52m 6s

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