fix(dashpay): remove duplicated contenderJoinDeadline after parallel merges

[QuantumExplorer]

Issue being fixed or feature implemented

develop does not compile after the last two merges: #958's branch and #965 each added an identical contenderJoinDeadline(voteEnd:) to UsernameMarketplaceService, and the squash merges landed both — "invalid redeclaration of 'contenderJoinDeadline(voteEnd:)'".

What was done

Removed one of the two byte-identical copies. No behavior change.

How Has This Been Tested?

Clean dashpay arm64 simulator build on develop + this commit (develop alone fails). (Unit-test target pre-existing broken.)

Breaking Changes

None.

Checklist:

• I have performed a self-review of my own code
• I have added or updated relevant unit/integration/functional/e2e tests

🤖 Generated with Claude Code

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Review details

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Configuration used: defaults

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Run ID: 4a444f8f-771c-4718-a864-ab2b7b47e8a3

📥 Commits

Reviewing files that changed from the base of the PR and between 007785a and 4e44b9f.

📒 Files selected for processing (1)

• DashWallet/Sources/Infrastructure/SwiftDashSDK/UsernameMarketplaceService.swift

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