Fixes twitch for the panel

[NejcZdovc]

Resolves brave/brave-browser#5549

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
  • Android
  • iOS
  • Linux
  • macOS
  • Windows
• Verified that these changes pass automated tests (unit, browser, security tests) on
  • iOS
  • Linux
  • macOS
  • Windows
• Verified that all lint errors/warnings are resolved (npm run lint)
• 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
• Public documentation has been updated as necessary. 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-Protection-Mode
  • 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-issues-with-tracking-protection
  • https://github.com/brave/brave-browser/wiki/QA-Guide

Test Plan:

• enable rewards
• go to twitch
• go to some channels and vods
• on every page open the panel and make sure that correct publisher is displayed in there

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

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.

[emerick]

LGTM

[LaurenWags]

Verified test plan using

Brave	0.71.51 Chromium: 76.0.3809.132 (Official Build) nightly (64-bit)
Revision	fd1acc410994a7a68ac25bc77513d443f3130860-refs/branch-heads/3809@{#1035}
OS	Mac OS X

• Ensured information displayed for verified, connected, and non-verified publishers (using staging env only).
• Logged verified logo not displaying until panel is opened for Twitch publishers brave-browser#5848 for the verified icon on the BAT logo - it only displays once you open the panel. Other publisher types (YouTube, regular sites, vimeo, github, reddit) don't have this issue.
• Encountered generic twitch favicon displayed for verified twitch publisher brave-browser#3330 (comment) for favicon - verified pubs are showing the generic Twitch favicon on panel, AC, tips, etc.

Panel for Verified Twitch Publisher:

Panel for Connected, not verified Twitch Publisher:

Panel for unverified Twitch Publisher: