fix: duplicate votes for same voter #755

Job	Run time
Clippy	1m 45s
Tests	1m 44s
Format	59s
Docker (chain, chain)	1m 24s
Docker (governance, governance)	1m 23s
Validate Swagger	26s
Docker (pos, pos)	1m 25s
Docker (rewards, rewards)	1m 22s
Docker (seeder, seeder)	1m 22s
Docker (webserver, webserver)	1m 23s
Docker (parameters, parameters)	1m 23s
Docker (transactions, transactions)	1m 23s
can_enqueue	1s
can_merge	1s
	16m 1s

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