Bug Fix: Set default and base currency with string argument on select

[Vikhthor]

The currency type is string and not a object with code. The currency object with code attribute is only available as the second argument of the onSelectCurrency event handler which is not used here

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (d2e5de6) to head (e6b6657).

Additional details and impacted files

@@             Coverage Diff             @@
##                main       #21   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity      1249      1249           
===========================================
  Files             74        74           
  Lines           6981      6981           
===========================================
  Hits            6981      6981           

Flag	Coverage Δ
backend	100.00% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.