fix(wallet): fix ERC20 Approve amount for unlimited case

[onyb]

Resolves brave/brave-browser#26807

Submitter Checklist:

• I confirm that no security/privacy review is needed, or that I have requested one
• There is a ticket for my issue
• Used Github auto-closing keywords in the PR description above
• Wrote a good PR/commit description
• Squashed any review feedback or "fixup" commits before merge, so that history is a record of what happened in the repo, not your PR
• Added appropriate labels (QA/Yes or QA/No; release-notes/include or release-notes/exclude; OS/...) to the associated issue
• Checked the PR locally: npm run test -- brave_browser_tests, npm run test -- brave_unit_tests, npm run lint, npm run gn_check, npm run tslint
• Ran git rebase master (if needed)

Reviewer Checklist:

• A security review is not needed, or a link to one is included in the PR description
• New files have MPL-2.0 license header
• Adequate test coverage exists to prevent regressions
• Major classes, functions and non-trivial code blocks are well-commented
• Changes in component dependencies are properly reflected in gn
• Code follows the style guide
• Test plan is specified in PR before merging

After-merge Checklist:

• The associated issue milestone is set to the smallest version that the
  changes has landed on
• All relevant documentation has been updated, for instance:
  • https://github.com/brave/brave-browser/wiki/Deviations-from-Chromium-(features-we-disable-or-remove)
  • https://github.com/brave/brave-browser/wiki/Proxy-redirected-URLs
  • https://github.com/brave/brave-browser/wiki/Fingerprinting-Protections
  • https://github.com/brave/brave-browser/wiki/Brave%E2%80%99s-Use-of-Referral-Codes
  • https://github.com/brave/brave-browser/wiki/Custom-Headers
  • https://github.com/brave/brave-browser/wiki/Web-Compatibility-Exceptions-in-Brave
  • https://github.com/brave/brave-browser/wiki/QA-Guide
  • https://github.com/brave/brave-browser/wiki/P3A

Demo

Before	After

Steps to reproduce

1. Create a Swap transaction, where the FROM asset has never been used before for swapping.
2. This should trigger the "Activate " button. Complete the approval transaction.
3. Head to transaction history in the panel, and open the detail view for the approval transaction.

[brave-builds]

A Storybook has been deployed to preview UI for the latest push

[Douglashdaniel]

++

[brave-builds]

A Storybook has been deployed to preview UI for the latest push

[srirambv]

Verification passed on

Brave	1.47.84 Chromium: 108.0.5359.48 (Official Build) nightly (64-bit)
Revision	18ceeca0d99318e70c00d2e04d88aa55488b5c63-refs/branch-heads/5359@{#854}
OS	Linux

• Verified steps from PR
• Verified ERC20 Approve amount for unlimited case shows Unlimited instead of long value

1.47.75	1.47.84