fix(LIVE-14547) do not set ptxSwapCoreExperiment as false in analytics

[Couto]

✅ Checklist

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

📝 Description

The ptxSwapCoreExperiment could have the following values: false, Demo0, Demo3 or Demo3Thorswap, however, in the segment analytics, the false value makes no sense, by setting as undefined we don't send the flag.

❓ Context

LIVE-14547

🧐 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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