chore(ui-ux): remove usdt in denomination

[pierregee]

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

The following translations are missing for this pull request.

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[github-actions[bot]]

Build preview for DeFiChain Wallet is ready!

Built with commit 27bc7f56c2a03bbf50b099f38cc44b04c9b3986e

https://expo.io/@defichain/wallet?release-channel=pr-preview-4187

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 42.85714% with 4 lines in your changes missing coverage. Please review.

Project coverage is 54.79%. Comparing base (d1cd46b) to head (50b2128).

Files	Patch %	Lines
...or/screens/Portfolio/components/TotalPortfolio.tsx	0.00%	2 Missing :warning:
...gator/screens/Portfolio/hooks/PortfolioCurrency.ts	60.00%	1 Missing and 1 partial :warning:

:exclamation: There is a different number of reports uploaded between BASE (d1cd46b) and HEAD (50b2128). Click for more details.

HEAD has 145 uploads less than BASE

| Flag | BASE (d1cd46b) | HEAD (50b2128) | |------|------|------| ||151|6|

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #4187 +/- ## ========================================== - Coverage 59.98% 54.79% -5.20% ========================================== Files 442 442 Lines 12581 12586 +5 Branches 4129 4133 +4 ========================================== - Hits 7547 6896 -651 - Misses 4974 5618 +644 - Partials 60 72 +12 ```

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