If client database says promotion is OVER but server says it is not, then set the promotion to ACTIVE

[Miyayes]

Description

Implement a fix such that if the client DB says that a promotion is OVER, but the server says it not, then set the promotion back to ACTIVE.

This will improve resilience and clear up some cases users are experiencing.

cc: @evq @zenparsing

[stephendonner]

Verified PASSED using the testplan from brave/brave-core#8268 with nightly build

Brave	1.24.35 Chromium: 90.0.4430.41 (Official Build) nightly (x86_64)
Revision	e9c92b1eaca8487e212f3f6bc081fdb6d4863759-refs/branch-heads/4430@{#723}
OS	macOS Version 11.2.3 (Build 20D91)

Steps:

1. Started the browser with a clean profile pointed to staging: --args --enable-logging=stderr --vmodule="*/bat-native-ledger/*"=6,"*/brave_rewards/*"=6,"*/bat-native-ads/*"=6,"*/bat-native-confirmations/*"=6,"*/brave_ads/*"=6,"*/brave_user_model/*"=6 --brave-ads-staging --brave-ads-debug --rewards=staging=true,reconcile_interval=5,persist-logs=true
2. Clicked the Rewards icon to initialize rewards and download a UGP promotion (but did not yet claim it).
3. Closed the browser.
4. Opened the rewards database in DB Browser for SQLite and viewed the contents of the promotions table. Found the promotion record corresponding to the UGP and set the status field to 5; clicked Write changes then Close database.

publisher_info_db, claim status 0	publisher_info_db, claim status 5

I also removed "promotion_last_fetch_stamp":"1617137167", from Preferences in Default so the server would re-issue the promotional grant.

5. Started the browser.
6. Navigated to brave://rewards.
7. Verifed that the UGP promotion can be claimed.

UGP grant available	UGP grant claimed	brave://rewards

[kjozwiak]

Removing OS/Android as we don't have the ability to edit the Preferences file or update the rewards database. We do have the ability to export/import the database, but can't edit the Preference file so I don't think there's a way that we can get the server to re-issue the UGP grant on Android. @Miyayes @zenparsing @SergeyZhukovsky please let me know if anyone has any objections.