Fix custom tracing b58 printing #66

Job	Run time
build	4m 9s
clippy	1m 32s
fmt	6s
tests (file-store)	1m 30s
tests (mobile-packet-verifier)	1m 37s
tests (ingest)	1m 30s
tests (reward-scheduler)	46s
tests (task-manager)	50s
tests-postgres (boost-manager)	2m 20s
tests-postgres (iot-config)	2m 24s
tests-postgres (iot-packet-verifier)	3m 6s
tests-postgres (iot-verifier)	2m 29s
tests-postgres (mobile-config)	2m 25s
tests-postgres (mobile-verifier)	2m 11s
build-release	0s
	26m 55s

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