Fix deleteProposal() and missing PaymentAddress

[JSKitty]

Abstract

This is a rather simple PR that fixes two critical bugs that can cause loss of funds and/or failure to submit or finalise a proposal on v1.1.0.

• localProposals were missing PaymentAddress, leading to renderProposals failing, causing the entire Governance Dashboard to fail to render, and cascade errors up the stack.
• deleteProposal() was also badly written: it filtered proposals that were NOT the target proposal, it had a txid typo using txId which never existed, and it was just generally unreadable, I've rewritten the function to fix the bugs and be far easier to review.

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Testing

To test this PR, it's suggested to attempt these user flows, or variations of these:

• Switch to Testnet.
• Import / Create a wallet with at least 150 tPIV.
• Create some proposals (in any speed or quantity you desire).
• Finalise the proposals (this requires waiting 6 blocks for each proposal).

If all of the above, and variations of such; go without error, then things are looking bright!

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What does this PR address?

It addresses two critical bugs that could cause loss of funds, as well as complete failure of MPW's Governance and Proposal Submission Dashboard, these were encountered by a mainnet user, and were verified this morning by myself on testnet.

[Liquid369]

tACK 93ae2cd
Multiple proposals were created, spammed, and finalized.
No issues with the loss of funds, each was propagated successfully.
Reloaded and all seems well.

[BreadJS]

Works amazing! LGTM! 💪