Remove a patch for the Ckeditor Bootstrap Buttons module that 'support' CKeditor 5

[aleevas]

For now, this patch is not working as expected. Moreover, it calls some issues like this one DS-1322 So, it will be better to remove it and find another way to implement this.

Steps for review

• [ ] go to a site with Lilly or Rose theme (for example, https://sandbox-lily-std-virtual-y.y.org/)
• [ ] verify that the header doesn't break

General checks

• [ ] All coding styles are fulfilled and there are no any issues reported by CodeSniffer. See Code of Conduct.
• [ ] Try to use Conventional commit messages accordingly to the standard https://www.conventionalcommits.org/en/v1.0.0/#specification
• [ ] Documentation has been updated according to PR changes.
• [ ] Steps for review have been provided according to PR changes.
  
• [ ] Make sure you've provided all necessary hook_update_N to support upgrade path.
• [ ] Make sure your git email is associated with an account on drupal.org, otherwise, you won't get commits there.
  
• [ ] If you would like to get credits on drupal.org, check documentation.

Thank you for your contribution!

[ciboxbot]

Can one of the admins verify this patch? Use "o+k to test" or ''t+est this please" for manual build execution.

[rollki]

LGTM.