Update learn_the_basics.ipynb

[zloid89]

Minor error fix in learn_the_basics

Renaming column 'ASSIGNMENT:worker_id': 'performer' in answers_df will cause an error on the next step.

Description

String 669. Renaming column 'ASSIGNMENT:worker_id': 'performer' in answers_df will cause an error on the next step - "Run majority vote aggregation". It could me solved by renaming the column to "worker".

Connected issues (if any)

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Documentation and examples improvement (changes affected documentation and/or examples)

Checklist:

• [x] I have read the CONTRIBUTING document.
• [x] I hereby agree to the terms of the CLA available at: https://yandex.ru/legal/cla/?lang=en
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.

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[Pocoder]

@zloid89 Hello, could you rebase to master, please, to make tests pass

[DrhF]

Fixed in https://github.com/Toloka/toloka-kit/pull/83