Use compile-time vars for rewards Uphold settings

[zenparsing]

Uphold settings used by bat-native-ledger should be specified using compile-time variables.

[stephendonner]

Verified PASSED using 1.24 (beta) with the testplan from brave/brave-core#8380

Steps:

1. Started browser with ./Brave\ Browser\ Beta --enable-logging=stderr --vmodule="*/bat-native-ledger/*"=6,"*/brave_rewards/*"=6,"*/bat-native-ads/*"=6,"*/bat-native-confirmations/*"=6,"*/brave_ads/*"=9,"*/brave_user_model/*"=6 --brave-ads-staging --brave-ads-debug --rewards=staging=true,reconcile-interval=4
2. Verified wallet and ensured that there were no errors (after enabling Rewards and accepting UGP grant)
3. Ensured that we connected to Uphold's staging server (https://wallet-sandbox.uphold.com/authorize/...)
4. Started browser with ./Brave\ Browser\ Beta --enable-logging=stderr --vmodule="*/bat-native-ledger/*"=6,"*/brave_rewards/*"=6,"*/bat-native-ads/*"=6,"*/bat-native-confirmations/*"=6,"*/brave_ads/*"=9,"*/brave_user_model/*"=6 --brave-ads-debug --rewards=staging=false,reconcile-interval=4
5. Verified wallet and ensured that there were no errors
6. Ensured that we connected to Uphold's production server

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[kjozwiak]

QA we'll only be able to check the Staging case on Android as there's no way for us to get a production grant so we can meet the 15 BAT limitation before creating an Uphold account. However, we need to wait till we get the RC uploaded by @SergeyZhukovsky into the BETA program as claiming grants doesn't work when you upload the aab via the internal sharing tool. Once we get the new RC, we'll ask @SergeyZhukovsky to upload and should be able to QA this quickly.

[stephendonner]

Verified PASSED on staging for Android 9, Google Pixel XL, with Brave 1.24.84, Chromium 90.0.4430.93, using the testplan from brave/brave-core#8380

Steps:

1. enabled verbose logging and Rewards staging via the QA Preferences menu, in Developer Options
2. restarted Brave
3. claimed UGP grant on staging of 30.000 BAT
4. connected to and verified my Uphold wallet

Confirmed we use Uphold's sandbox staging env:

 [ RESPONSE - OnRequest ]
    > Url: https://api-sandbox.uphold.com/v0/me/cards?q=currency:BAT
    > Result: Success
    > HTTP Code: 200
    > Body: [{"CreatedByApplicationId":"193a77cf-02e8-4e10-8127-8a1b5a8bfece","address":{"wire":"UH35E32B4B"},"available":"998.00","balance":"998.00","currency":"BAT","id":"XXXXXXXXXXXX","label":"Brave Browser","lastTransactionAt":"2021-04-30T20:08:39.417Z","settings":{"position":1,"protected":false,"starred":true},"normalized":[{"available":"1344.32","balance":"1344.32","currency":"USD"}],"wire":[{"accountName":"Uphold Europe Limited","address":{"line1":"Tartu mnt 2","line2":"10145 Tallinn, Estonia"},"bic":"LHVBEE22","currency":"EUR","iban":"EE76 7700 7710 0159 0178","name":"AS LHV Pank"},{"accountName":"Uphold HQ, Inc.","accountNumber":"299007316","address":{"line1":"99 Park Avenue, Floor 4","line2":"New York, NY 10016"},"bic":"MCBEUS33","currency":"USD","name":"Metropolitan Commercial Bank","routingNumber":"XXXXX"}]}

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---

Verification PASSED on Samsung Galaxy Tablet A running Android 10 using the following build:

1.24.84, Chromium 90.0.4430.93

Rewards Log

[ RESPONSE - OnRequest ]
    > Url: https://api-sandbox.uphold.com/v0/me/cards/3ada831b-1a43-43c2-bfe7-a8edd1c9491f
    > Result: Success
    > HTTP Code: 200
    > Body: {"CreatedByApplicationId":"193a77cf-02e8-4e10-8127-8a1b5a8bfece","address":{"wire":"UH36394F14"},"available":"198.25","balance":"198.25","currency":"BAT","id":"3ada831b-1a43-43c2-bfe7-a8edd1c9491f","label":"Brave Browser","lastTransactionAt":"2021-04-20T04:04:47.941Z","settings":{"position":1,"protected":false,"starred":true},"normalized":[{"available":"324.58","balance":"324.58","currency":"CAD"}],"wire":[{"accountName":"Uphold Europe Limited","address":{"line1":"Tartu mnt 2","line2":"10145 Tallinn, Estonia"},"bic":"LHVBEE22","currency":"EUR","iban":"EE76 7700 7710 0159 0178","name":"AS LHV Pank"},{"accountName":"Uphold HQ, Inc.","accountNumber":"xxxxxxx","address":{"line1":"99 Park Avenue, Floor 4","line2":"New York, NY 10016"},"bic":"MCBEUS33","currency":"USD","name":"Metropolitan Commercial Bank","routingNumber":"xxxxxxx"}]}

Example	Example	Example	Example	Example