Update getVoteChosen to also check ...metadata.memberAddress has voted

[jtrein]

We should also check the store.connectedMember.memberAddress against the vote's ...metadata.memberAddress. This is a safe check as delegates can vote. E.g. The account for a Snapshot Hub vote is set as the signer which could be a delegate of a member. An example:

1. Member delegates to another address.
2. Delegated-to address votes on a proposal.
3. Member is logged into the Dapp, but the UI does not show they already voted.

The above can happen as the check is checking the currently logged in account's address against the vote's signer.