Removed redundant method _beforeToHtml

[Usik2203]

Description (*)

This PR remove redundant method _beforeToHtml in \Magento\Newsletter\Block\Adminhtml\Subscriber
because this method just call parent _beforeToHtml method

Related Pull Requests

Fixed Issues (if relevant)

1. magento/magento2#<issue_number>: Issue title

Manual testing scenarios (*)

1. ...
2. ...

Questions or comments

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds are green)

[m2-assistant]

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[ihor-sviziev]

@magento run Functional Tests B2B, Functional Tests CE

[magento-engcom-team]

Hi @ihor-sviziev, thank you for the review.
ENGCOM-7005 has been created to process this Pull Request

[engcom-Alfa]

✔️ QA Passed

[m2-assistant]

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