🐛fix(crypto-icons): change size of polkadot icon

[LucasWerey]

✅ Checklist

• npx changeset was attached.
• Covered by automatic tests.
• Impact of the changes:
  • Polkadot icon

📝 Description

Polkadot icon was bigger than the others. Change the size inside the svg
To see the change you need to pnpm clean && pnpm store prune and pnpm i && pnpm build:lld:deps && pnpm build:llm:deps

Video :
https://github.com/user-attachments/assets/9290554e-3d0f-427d-8a95-346cee955195

Before	After

❓ Context

• JIRA or GitHub link: LIVE-11722

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🧐 Checklist for the PR Reviewers

• The code aligns with the requirements described in the linked JIRA or GitHub issue.
• The PR description clearly documents the changes made and explains any technical trade-offs or design decisions.
• There are no undocumented trade-offs, technical debt, or maintainability issues.
• The PR has been tested thoroughly, and any potential edge cases have been considered and handled.
• Any new dependencies have been justified and documented.
• Performance considerations have been taken into account. (changes have been profiled or benchmarked if necessary)

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