Fix custom tracing b58 printing (#823) #88

Job	Run time
build	11m 0s
clippy	1m 30s
fmt	5s
tests (file-store)	1m 45s
tests (mobile-packet-verifier)	1m 26s
tests (ingest)	1m 35s
tests (reward-scheduler)	42s
tests (task-manager)	45s
tests-postgres (boost-manager)	2m 3s
tests-postgres (iot-config)	2m 41s
tests-postgres (iot-packet-verifier)	3m 24s
tests-postgres (iot-verifier)	2m 7s
tests-postgres (mobile-config)	2m 8s
tests-postgres (mobile-verifier)	2m 25s
build-release	0s
	33m 36s

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