fix(ui-ux): fixed convert screen issue for evm domain

[fullstackninja864]

What this PR does / why we need it:

Which issue(s) does this PR fixes?:

Fixes DFC-401

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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[linear[bot]]

DFC-401 Should not able to change to address in evm domain while converting tokens

[image.png](https://uploads.linear.app/ed7438a1-0dae-40df-9d75-9ba5b0ba89d2/1abba8ef-70b3-4cf4-9169-26f3b53d2902/2c0a3feb-2c79-4b45-bdfe-1089d91444be)

[github-actions[bot]]

Build preview for DeFiChain Wallet is ready!

Built with commit ba6dd92c4678e1ffdd5dd2beee5fa00f2d66fe86

https://expo.io/@defichain/wallet?release-channel=pr-preview-4122

[codecov-commenter]

Codecov Report

Merging #4122 (f8f4ff6) into main (9b52cb0) will decrease coverage by 2.23%. The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main    #4122      +/-   ##
==========================================
- Coverage   56.06%   53.83%   -2.23%     
==========================================
  Files         438      438              
  Lines       12353    12357       +4     
  Branches     4090     4093       +3     
==========================================
- Hits         6926     6653     -273     
- Misses       5343     5622     +279     
+ Partials       84       82       -2     

Files	Coverage Δ
...igator/screens/Portfolio/screens/ConvertScreen.tsx	51.58% <50.00%> (+0.89%)	:arrow_up:

... and 12 files with indirect coverage changes

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