Fix issue with address comparison

[stonega]

Link to Shortcut ticket:

What does this PR do?

Fix issue with address comparison, which caused page load error with proposal id executive page.
https://vote.makerdao.com/executive/0x70254bd530684cf4a6323f51098fa39aae6130b6

Steps for testing:

Visit https://vote.makerdao.com/address/0xa16d0708706245e5e27ac8f118776f5ed1c78d90#comments
Click View Executive

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Any additional helpful information?:

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[vercel]

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[what-the-diff]

PR Summary

• Improved Address Comparison in 'getExecutiveProposal' function
  The logic for comparing addresses in the 'getExecutiveProposal' function has been updated. Earlier, the comparison was case-sensitive, potentially causing mismatches if the same address was entered with different case usage. With this update, the comparison is now case-insensitive, offering a more robust and accurate match. Both the 'proposalId' and 'proposal.address' are converted to lowercase before the comparison, ensuring consistency.