fix(erc20): remove macro export from burnable

[qalisander]

Resolves #73

PR Checklist

• [-] Tests
• Documentation

[netlify]

👷 Deploy request for contracts-stylus pending review.

A Netlify team Owner will need to approve the deploy before you can run your build.

Are you a team Owner? Visit the deploys page to approve it →

Need more help? Learn more in the Netlify docs →

Name	Link
🔨 Latest commit	ad0c859

[codecov]

The author of this PR, qalisander, is not an activated member of this organization on Codecov.
Please activate this user on Codecov to display this PR comment.
Coverage data is still being uploaded to Codecov.io for purposes of overall coverage calculations.
Please don't hesitate to email us at [email protected] with any questions.

[qalisander]

I think better not to advertise this approach in public since it pretends that methods will be exported.
In reality it is not.
New tests for burnable example should be added after integration testing pipeline will take a place.

[alexfertel]

Ah, I think @bidzyyys also implemented this change in #71 @qalisander

[bidzyyys]

That is right, it is refactored & removed in #71

[bidzyyys]

IMHO we should close the PR as it duplicates #71

[qalisander]

Pardon, just noticed. Thought pausable pr will be just for pausable:) But you @bidzyyys can consider this approach create separate example for a burnable erc20 extension (if u think it makes sense ofk)

[bidzyyys]

Pardon, just noticed. Thought pausable pr will be just for pausable:)

I needed to refactor burnable macros to enable when_not_paused check in burn and burn_from. But I do agree that it is misleading 😅