Fix default for custom tracing #305

Job	Run time
clippy	1m 45s
fmt	5s
build	2m 29s
tests (coverage-map)	1m 14s
tests (coverage-point-calculator)	1m 32s
tests (ingest)	2m 0s
tests (mobile-packet-verifier)	2m 8s
tests (reward-scheduler)	1m 3s
tests (task-manager)	46s
tests-postgres (boost-manager)	2m 40s
tests-postgres (file-store)	2m 10s
tests-postgres (iot-config)	2m 24s
tests-postgres (iot-packet-verifier)	3m 38s
tests-postgres (iot-verifier)	2m 35s
tests-postgres (mobile-config)	2m 13s
tests-postgres (mobile-verifier)	2m 32s
build-release	0s
	31m 14s

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