Fix `roll_time` and `auto_commit` settings for `FileSink` #299

Job	Run time
build	2m 8s
clippy	1m 43s
fmt	6s
tests (coverage-point-calculator)	1m 44s
tests (ingest)	1m 54s
tests (reward-scheduler)	1m 22s
tests (task-manager)	1m 18s
tests (coverage-map)	1m 13s
tests-postgres (boost-manager)	2m 44s
tests-postgres (file-store)	2m 0s
tests-postgres (iot-config)	2m 36s
tests-postgres (iot-packet-verifier)	4m 12s
tests-postgres (iot-verifier)	3m 34s
tests-postgres (mobile-config)	2m 45s
tests-postgres (mobile-packet-verifier)	2m 44s
tests-postgres (mobile-verifier)	3m 1s
build-release	0s
	35m 4s

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