fix: blockscout evm explorer testnet url

[drewstone]

Summary of changes

Provide a detailed description of proposed changes.

• Fixes the testnet evm explorer URL

Proposed area of change

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• [ ] Overview
• [ ] Anchor System
• [ ] dApps
• [x] Tangle
• [ ] Protocols
• [ ] Relayers

Reference issue to close (if applicable)

Specify any issues that can be closed from these changes (e.g. Closes #233).

• Closes

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Code Checklist

• [ ] I have tested that prove my changes are working as intended
• [ ] I have added necessary documentation (if appropriate)

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