Fix offline signing examples #310

Job	Run time
Check common feature sets (pow)	1m 4s
Check common feature sets (irc_27)	1m 3s
Check common feature sets (irc_30)	1m 21s
Check common feature sets (client,private_key_secret_manager)	1m 38s
Check common feature sets (client,mqtt)	1m 28s
Check common feature sets (client,participation)	1m 19s
Check common feature sets (wallet,storage)	1m 41s
Check common feature sets (wallet,stronghold)	2m 40s
Check common feature sets (wallet,rocksdb)	12m 51s
Check common feature sets (wallet,participation)	1m 22s
Check common feature sets (wallet,events)	1m 22s
Check common feature sets (wallet,events,ledger_nano)	1m 26s
	29m 15s

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