Fixes balance drop on Android (uplift to 1.10.x)

[NejcZdovc]

Uplift of #5935
Resolves brave/brave-browser#9992

Approved, please ensure that before merging:

• You have checked CI and the builds, lint, and tests all pass or are not related to your PR.
• You have tested your change on Nightly.
• Compiled this branch from source and manually tested!
• The PR milestones match the branch they are landing to.

After you merge:

• The associated issue milestone is set to the smallest version that the changes is landed on.

[bsclifton]

I built from scratch locally (1.10.x) and ran through two scenarios with @NejcZdovc over Zoom:

1. Recover unused grant:

• new profile
• claim grant; verify amount shows
• quit browser
• edit Default/publisher_info_db:
  • delete all unblinded_tokens entries
  • change type in promotion from 0 to 1
• edit default/Preferences file; change empty_balance_checked to false
• full grant immediately recovered 🎉

2. Recover partially used grant:

• new profile
• claim grant; verify amount shows
• make a 5 BAT tip to https://bvsriram.github.io/ and verify amount is deducted
• edit Default/publisher_info_db:
  • delete all unblinded_tokens entries
  • change type in promotion from 0 to 1
• edit default/Preferences file; change empty_balance_checked to false
• proper grant amount discovered- server is notified of the proper amount and sends back a 201 SUCCESS response 🎉

Ran locally built using npm run start -- --rewards=development=true --log-level=2 --enable-logging=stderr

[NejcZdovc]

CI only failed on macos browser test https://ci.brave.com/job/pr-brave-browser-fix-empty-balance-1.10/6/execution/node/542/log/

1 test failed:
10:14:48      BraveRewardsBrowserTest.NotVerifiedWallet (../../brave/components/brave_rewards/browser/rewards_service_browsertest.cc:2433)

It's a known intermittent problem. All is good