Fix block issuer key from bytes conversion (#2249) #4543

Job	Run time
Check common feature sets (irc_27)	52s
Check common feature sets (irc_30)	49s
Check common feature sets (client,private_key_secret_manager)	1m 4s
Check common feature sets (client,mqtt)	1m 10s
Check common feature sets (client,participation)	1m 4s
Check common feature sets (wallet,storage)	1m 19s
Check common feature sets (wallet,stronghold)	1m 49s
Check common feature sets (wallet,rocksdb)	5m 56s
Check common feature sets (wallet,participation)	1m 0s
Check common feature sets (wallet,events)	1m 1s
Check common feature sets (wallet,events,ledger_nano)	1m 33s
	17m 37s

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