Fixes publisher list re-try logic

[NejcZdovc]

Resolves brave/brave-browser#3639

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
• 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

Test Plan:

• clean profile
• enable rewards
• go to profile folder and make sure that you see publisher_list file
• close browser
• delete publisher_list file
• start browser again
• make sure that file is downloaded again without any delay (like minutes)

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

[NejcZdovc]

retry timer was reduced to 1-5min as it's really important to get this list asap. Endpoint is behind CDN so we should be good here

[jasonrsadler]

browser_tests are failing.

Getting spammed with error:

[13008:775:0325/103315.310392:INFO:confirmations_impl.cc(638)] OnTimer:
  timer_id: 5
  retry_getting_signed_tokens_timer_id_: 0
  payout_redeemed_tokens_timer_id_: 0
[13008:775:0325/103315.318928:ERROR:ledger_impl.cc(805)] Can't fetch publisher list
[13008:775:0325/103315.321677:INFO:confirmations_impl.cc(413)] Successfully saved confirmations state

fixed