fix: duplicate votes for same voter #757

Job	Run time
Clippy	2m 3s
Validate Swagger	28s
Format	28s
Docker (chain, chain)	1m 34s
Tests	3m 33s
Docker (governance, governance)	1m 35s
Docker (pos, pos)	1m 33s
Docker (rewards, rewards)	1m 33s
Docker (seeder, seeder)	1m 23s
Docker (webserver, webserver)	1m 31s
Docker (parameters, parameters)	1m 33s
Docker (transactions, transactions)	1m 33s
can_enqueue	1s
can_merge	0s
	18m 48s

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