chore: update saveTx endpoint

[chloezxyy]

What this PR does / why we need it:

Which issue(s) does this PR fixes?:

Fixes #

Additional comments?:

Developer Checklist:

• [ ] Read your code changes at least once
• [ ] Tested on iOS/Android device (e.g, No crashes, library supported etc.)
• [ ] No console errors on web
• [ ] Tested on Light mode and Dark mode*
• [ ] Your UI implementation visually matched the rendered design*
• [ ] Unit tests*
• [ ] Added e2e tests*
• [ ] Added translations*

[github-actions[bot]]

Missing Translations Report

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[github-actions[bot]]

Build preview for DeFiChain Wallet is ready!

Built with commit ff1a3c9260baeacf0fefb8921adda621845ee524

https://expo.io/@defichain/wallet?release-channel=pr-preview-4175

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 53.60%. Comparing base (c0c4a35) to head (7539141).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #4175 +/- ## ========================================== - Coverage 57.03% 53.60% -3.44% ========================================== Files 438 438 Lines 12502 12502 Branches 4142 4142 ========================================== - Hits 7131 6702 -429 - Misses 5282 5719 +437 + Partials 89 81 -8 ```

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