support: add Fluence FLT token icon

[DatDraggy]

✅ Checklist

• npx changeset was attached.
• Covered by automatic tests. Is an icon
• Impact of the changes:
  • "@ledgerhq/crypto-icons-ui": major

📝 Description

Adding the icon for the soon to be added FLT Token after the end-of-year freeze.
Was confirmed by Rammy - Ledger on Discord that the token is in the process of manually being added.
ERC-20 token FLT contract address: 0x236501327e701692a281934230af0b6be8df3353

❓ Context

• JIRA or GitHub link: https://github.com/DatDraggy/ledger-live/tree/support/add-flt-icon

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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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