docs: removed duplicate entry from the README.md file.

[dlemstra]

Description

Just a tiny change that removes the duplicate entry.

Checklist

• New tests and/or benchmarks are included
• Documentation is changed or added
• I have signed the MongoDB Contributor License Agreement (https://www.mongodb.com/legal/contributor-agreement)

Motivation and Context

• Bugfix
• New feature
• Dependency update
• Misc

Open Questions

Dependents

Types of changes

• Backport Needed
• Patch (non-breaking change which fixes an issue)
• Minor (non-breaking change which adds functionality)
• Major (fix or feature that would cause existing functionality to change)

[Copilot]

Pull Request Overview

This PR removes a duplicate configuration entry from the README.md file to clean up the documentation.

• Removes duplicate mdb.confirmRunCopilotCode setting entry from the configuration table

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