fix(ui-ux): hide Get DFI btn on empty portfolio screen

[fullstackninja864]

What this PR does / why we need it:

Which issue(s) does this PR fixes?:

Fixes DFC-360

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*

[linear[bot]]

DFC-360 Get DFI in EVM flow - User is not redirected to Convert flow upon clicking Get DFI

#### What happened? 1. Match contents as expected. Rename CTA to "Get DFI-EVM" 2. Step3 - Convert to DFi-EVM tokens is missing 3. There are DFI tokens but user is not redirected to convert flow upon clicking "Get DFI" #### What did you expect to happen? [IMG_11A8E9508E3E-1.jpeg](https://uploads.linear.app/ed7438a1-0dae-40df-9d75-9ba5b0ba89d2/4a296af6-e683-4476-9d77-4abc4cae1b78/ccef0e2e-31b1-4755-ae95-6396d47d3c71) [IMG_3A13DFC716E7-1.jpeg](https://uploads.linear.app/ed7438a1-0dae-40df-9d75-9ba5b0ba89d2/7d7cf7c1-947b-4839-b5da-c939ade320aa/cd271e7e-a4d0-4459-ba6c-4f5bc9398cd3) #### How to reproduce it (as minimally and precisely as possible): #### Anything else that the team needs to know?

[github-actions[bot]]

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[github-actions[bot]]

Build preview for DeFiChain Wallet is ready!

Built with commit 56b51f9f1f560604f24bd55cc527ed00b57150dd

https://expo.io/@defichain/wallet?release-channel=pr-preview-4080