LIVE-13753 use mainaccount unit to display fees if no fees options

[Wozacosta]

✅ Checklist

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

📝 Description

The gas fees unit displayed was that of the token account and not of the main account.

BEFORE / AFTER:

On LLD there is no issue (anymore, as it was fixed recently in https://ledgerhq.atlassian.net/jira/software/c/projects/LIVE/boards/465?selectedIssue=LIVE-13362):

❓ Context

• JIRA or GitHub link: LIVE-13753

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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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