changed Belarus flag to white-red-white

[alehpa]

Issue: No open issue. Have discussion with author beforehand.

Requirements

• Filling out the template is required. Any pull request that does not include enough information to be reviewed in a timely manner may be closed at the maintainers' discretion.

• [ ] issue was opened to discuss proposed changes before starting implementation. It is important do discuss changes before implementing them (Why should we add it? How should it work? How should it look? Where will it be? ...).
• [x] during development, node version specified in package.json was used (ie using nvm).
• [x] package versions and package-lock.json were not changed (npm install --no-save).
• [x] app version number was not changed.
• [x] all new code has tests to ensure against regressions.
• [x] npm run lint reports no offenses.
• [x] npm run test is error-free.
• [x] README and CHANGELOG were updated accordingly.
• [x] after PR is approved, all commits in it are squashed

Description of the Change

Replaced flag of Belarus to national white-red-white.

Verification Process

Checked Svg file - looks great!

Other information

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (5289efa) 72.39% compared to head (7b63c1e) 72.39%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## trunk #1421 +/- ## ======================================= Coverage 72.39% 72.39% ======================================= Files 14 14 Lines 355 355 ======================================= Hits 257 257 Misses 98 98 ```

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