Update Voting.sol: Enhanced 'Slots' usage

[0xScratch]

🛠️ Fixes Issue

The contract is using more slots than necessary. Actually, EVM provided every smart contract some slots for storage. The more you use them, the more the gas costs. Thus, finding a way to reduce them is a great way to have some gas optimizations

👨‍💻 Changes proposed

Just changed the order of state variables. For a better explanation, refer this PR -> https://github.com/allo-protocol/allo-v2/pull/237

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• [x] My code follows the code style of this project.
• [x] This PR does not contain plagiarized content.
• [x] The title of my pull request is a short description of the requested changes.

[github-actions[bot]]

Our team will soon review your PR. Thanks @Aryan9592 :)