Change depositPct to requiredDeposit

[deweller]

Integer math causes off-by-one errors.

We should just store the requiredDeposit in the contract and not a percentage of the bounty.

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platform – ./frontend

🔍 Inspect: https://vercel.com/engineerdao/platform/TyirB4AYq2y7FHe1kMBYrRMvnSzm
✅ Preview: https://platform-git-issue-102-do-not-store-deposit-pct-engineerdao.vercel.app

backend – ./backend

🔍 Inspect: https://vercel.com/engineerdao/backend/6r6wwP48H1tNJxHyHSL6UfQavqZ3
✅ Preview: https://backend-git-issue-102-do-not-store-deposit-pct-engineerdao.vercel.app

[deweller]

Closes #102