Adding option to restore excluded pubs

[ryanml]

Fixes: brave/brave-browser#936

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).
• 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/Needed or QA/No-QA-Needed) to include the closed issue in milestone

Test Plan:

1. Build Brave from this branch, and start with a clean profile
2. Enable rewards
3. Visit 7 - 10 sites so that they get added to the contribution table
4. Exclude some sites.
5. Hit the Restore action under the modal title
6. Ensure the excluded sites are restored.
7. Ensure that those sites can be re-excluded then restored.

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

[jasonrsadler]

Can you squash commits?

[ryanml]

@jasonrsadler - I can, but the additional commit was an existing issue within the publisher db logic and I wanted to leave it up for visibility. Let me know what you think, thanks!

[jasonrsadler]

No prob. Was going off check off list up top. Leave as is. 👍

[jasonrsadler]

Is the text coming later or should it already be there?

[jasonrsadler]

Do we plan to allow excluding if we have less than 6 publishers? Also, how do we unexclude if we remove publishers to having less than 6. Is that all addressed on a separate issue?

[ryanml]

@jasonrsadler I may have to address this issue in brave-ui, as only the modal has UX for the restore button

[ryanml]

@jasonrsadler locales added in to core

[jasonrsadler]

Removing a youtube publisher crashes Brave.

[ryanml]

@jasonrsadler media publishers should be removable now

changes made

[jasonrsadler]

!! ++ Works very good! Good job!

[jasonrsadler]

[bbondy]

Added label merged/0.55.x
Reverted 5630677 because no issue reference and bad commit message.

0.55.x revert f55ad6e
0.55.x 362008a
master 3bdda03