Fix thumbs down should dislike a Brave ad

[tmancey]

Resolves brave/brave-browser#26202

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

Test Plan:

Confirm "downvote" (aka dislike) confirmation is sent when disliking a Brave ad on the 30 day ads history in brave://rewards

[btlechowski]

Verification passed on

Brave	1.47.15 Chromium: 107.0.5304.62 (Official Build) nightly (64-bit)
Revision	1eec40d3a5764881c92085aaee66d25075c159aa-refs/branch-heads/5304@{#942}
OS	Ubuntu 18.04 LTS

Verified thumbs down works as expected in UI

Verified downvote confirmation is sent

[8955:8955:1024/232525.213396:VERBOSE1:redeem_unblinded_token.cc(367)] Successfully redeemed unblinded token downvote confirmation for ad_notification with transaction id e9e4af00-41cb-46ca-a53a-c2363131d2a6 and creative instance id 0210de7e-2a7a-4ba7-af73-960acaac63fe

Verified the advertiser is blocked:

Verified the advertiser is unblocked when downvote is removed

Verified upvote works as expected in UI

Verified upvote confirmation is sent

[8955:8955:1024/233003.106059:VERBOSE1:redeem_unblinded_token.cc(367)] Successfully redeemed unblinded token upvote confirmation for ad_notification with transaction id bb6936b8-53a4-436b-a80a-578279de4aa5 and creative instance id 0210de7e-2a7a-4ba7-af73-960acaac63fe

Verified block category button works:

Verified the category is added to the filter list: