Fixes transaction amount

[NejcZdovc]

Resolves brave/brave-browser#11818

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
  • Android
  • iOS
  • Linux
  • macOS
  • Windows
• Verified that these changes pass automated tests (unit, browser, security tests) on
  • iOS
  • Linux
  • macOS
  • Windows
• Verified that all lint errors/warnings are resolved (npm run lint, npm run gn_check)
• Ran git rebase master (if needed).
• Ran git rebase -i to squash commits (if needed).
• Tagged reviewers and labelled the pull request as needed.
• Requested a security/privacy review as needed.
• Added appropriate QA labels (QA/Yes or QA/No) to the associated issue
• Added appropriate release note labels (release-notes/include or release-notes/exclude) to the associated issue
• Public documentation has been updated as necessary. For instance:
  • https://github.com/brave/brave-browser/wiki/Deviations-from-Chromium-(features-we-disable-or-remove)
  • https://github.com/brave/brave-browser/wiki/Proxy-redirected-URLs
  • https://github.com/brave/brave-browser/wiki/Fingerprinting-Protections
  • https://github.com/brave/brave-browser/wiki/Brave%E2%80%99s-Use-of-Referral-Codes
  • https://github.com/brave/brave-browser/wiki/Custom-Headers
  • https://github.com/brave/brave-browser/wiki/Web-compatibility-issues-with-tracking-protection
  • https://github.com/brave/brave-browser/wiki/QA-Guide

Test Plan:

defined in the issue

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

After-merge Checklist:

• The associated issue milestone is set to the smallest version that the
  changes has landed on.
• All relevant documentation has been updated.

[emerick]

LGTM

[bbondy]

Just checking if any old clients are sending this in the wrong format? Maybe need to make sure iOS gets this one if they recently updated to 1.15.x? cc @kylehickinson just in case.

[bbondy]

Snippet from the issue report:

Important: This is regression in 1.15.x. Not reproducible on 1.14.x

[btlechowski]

LGTM

Verification passed on

Brave	1.17.13 Chromium: 86.0.4240.68 (Official Build) nightly (64-bit)
Revision	ad72ee9aa8e15ed300df1238e76c7a8f4d686f97-refs/branch-heads/4240@{#1097}
OS	Ubuntu 18.04 LTS

No more errors in the logs.
Verified both transactions are successful:

For 0.05 BAT to Brave

[10381:10381:1005/184824.147968:VERBOSE5:ledger_impl.cc(133)] 
[ REQUEST ]
> URL: https://api-sandbox.uphold.com/v0/me/cards/fbd1546c-6706-4267-9e6c-3eda44945283/transactions
> Method: UrlMethod::POST
> Content: {"denomination":{"amount":"0.050000","currency":"BAT"},"destination":"1b2b466f-5c15-49bf-995e-c91777d3da93","message":"5% transaction fee collected by Brave Software International"}

[10381:10381:1005/184824.974332:VERBOSE6:logging_util.cc(136)] 
[ RESPONSE - OnRequest ]
> Url: https://api-sandbox.uphold.com/v0/me/cards/fbd1546c-6706-4267-9e6c-3eda44945283/transactions/
> Result: Success
> HTTP Code: 200
> Body: {"application":{"clientId":"4c","name":"Brave Browser"},"createdAt":"2020-10-05T16:48:23.135Z","denomination":{"pair":"BATBAT","rate":"1.00","amount":"0.05"

0.95 Bat to the creator:

[10381:10381:1005/184715.262668:VERBOSE5:ledger_impl.cc(133)] 
[ REQUEST ]
> URL: https://api-sandbox.uphold.com/v0/me/cards/fbd1546c-6706-4267-9e6c-3eda44945283/transactions
> Method: UrlMethod::POST
> Content: {"denomination":{"amount":"0.950000","currency":"BAT"},"destination":"0fd15856-ada1-45a3-9ec7-74ac4db76eec","message":""}

[10381:10381:1005/184716.146313:VERBOSE6:logging_util.cc(136)] 
[ RESPONSE - OnRequest ]
> Url: https://api-sandbox.uphold.com/v0/me/cards/fbd1546c-6706-4267-9e6c-3eda44945283/transactions/
> Result: Success
> HTTP Code: 200
> Body: {"application":{"clientId":"4c2b665ca060d912fec5c735c734859a06118cc8","name":"Brave Browser"},"createdAt":"2020-10-05T16:47:14.262Z","denomination":{"pair":"BATBAT","rate":"1.00","amount":"0.95","currency":"BAT"}

Verified the transactions are listed on uphold

Also verified by tipping 10 BAT to a youtube creator