Fixes empty state flow

[NejcZdovc]

Resolves brave/brave-browser#2350

Submitter Checklist:

• Submitted a ticket for my issue if one did not already exist.
• Used Github auto-closing keywords in the commit message.
• Added/updated tests for this change (for new code or code which already has tests).
• Verified that these changes build without errors on
  • Windows
  • macOS
  • Linux
• Verified that these changes pass automated tests (npm test brave_unit_tests && npm test brave_browser_tests) on
  • Windows
  • macOS
  • Linux
• Ran git rebase master (if needed).
• Ran git rebase -i to squash commits (if needed).
• Tagged reviewers and labelled the pull request as needed.
• Request a security/privacy review as needed.
• Add appropriate QA labels (QA/Yes or QA/No) to include the closed issue in milestone

Test Plan:

• do test flow from Set the UI value for emptyWallet #1004

• clean profile
• enable rewards via settings page
• make sure that you see no token
• claim grant
• make sure that you see wallet summary with grant in it

Reviewer Checklist:

• New files have MPL-2.0 license header.
• Request a security/privacy review as needed.
• Adequate test coverage exists to prevent regressions
• Verify test plan is specified in PR before merging to source

[bsclifton]

Works great! All tests pass and change looks good. Agreed- we'll want to rework this at a later time to move it out of OnWalletProperties. Great job 😄 👍

[bsclifton]

master 20172c4
0.59.x 9084490
0.58.x e35b93d
0.57.x 844bcca