Fix `roll_time` and `auto_commit` settings for `FileSink` #297

Job	Run time
fmt	4s
build	2m 17s
clippy	1m 46s
tests (coverage-point-calculator)	1m 19s
tests (ingest)	1m 47s
tests (coverage-map)	1m 12s
tests (reward-scheduler)	1m 4s
tests (task-manager)	1m 13s
tests-postgres (boost-manager)	3m 9s
tests-postgres (file-store)	2m 29s
tests-postgres (iot-config)	2m 26s
tests-postgres (iot-packet-verifier)	4m 5s
tests-postgres (iot-verifier)	2m 45s
tests-postgres (mobile-config)	2m 15s
tests-postgres (mobile-packet-verifier)	2m 34s
tests-postgres (mobile-verifier)	2m 31s
build-release	0s
	32m 56s

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