Remove Misleading Casper Token

[Canestin]

✅ Checklist

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

📝 Description

Currently, in the code /ledger-live/libs/ledgerjs/packages/cryptoassets/src/data/casper.ts, this hardcoded file gives the impression that Casper tokens can be added. However, it seems this was a copy-paste operation. To avoid confusion, we are removing it. If we ever need to support this, we will do it properly with CAL Importers compatibility.

❓ Context

• JIRA: https://ledgerhq.atlassian.net/browse/LIVE-15823

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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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[hedi-edelbloute]

Shouldn't we remove stuff in libs/ledgerjs/packages/cryptoassets/src/tokens.ts also ?