Fix brave-browser #36266: Buy/Send/Swap button is not opening in Asset Details Screen.

[nuo-xu]

Ref: https://github.com/brave/brave-core/pull/22229

Summary of Changes

Copy over the fix from brave-core to brave-ios for 1.62.x hotfix.

This pull request fixes #

Submitter Checklist:

• [x] Unit Tests are updated to cover new or changed functionality
• [x] User-facing strings use NSLocalizableString()
• [x] New or updated UI has been tested across:
  • [ ] Light & dark mode
  • [ ] Different size classes (iPhone, landscape, iPad)
  • [ ] Different dynamic type sizes

Test Plan:

Go to an asset details that no wallet account has balance of it click Buy/Send/Swap button button should open correct screen for users to buy/send/swap

Screenshots:

Reviewer Checklist:

• [ ] Issues include necessary QA labels:
  • QA/(Yes|No)
  • bug / enhancement
• [ ] Necessary security reviews have taken place.
• [ ] Adequate unit test coverage exists to prevent regressions.
• [ ] Adequate test plan exists for QA to validate (if applicable).
• [ ] Issue and pull request is assigned to a milestone (should happen at merge time).