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]

Missing Translations Report

The following translations are missing for this pull request.

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[github-actions]

Build preview for DeFiChain Wallet is ready!

Built with commit ff1a3c9

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

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

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

Additional details and impacted files

@@            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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