Add missing id attribute to the Reader.php

[FY0u11]

Add a missing ID attribute to the pagebuilder's config content type reader.

Description (*)

You can see that the commit only adds a single line of code. The reason we need this line is to allow developers to extend the additional_data/item[name="uploaderConfig"] key in the view/adminhtml/pagebuilder/content_type/*.xml files. I'm not sure whether the absence of this key was intentional or not, but without this fix, attempting to extend these XML files in a custom module will result in an exception. Personally, I tried to extend image.xml, banner.xml, and slide.xml to add webp and avif to the allowedExtensions.

Story

Bug

Task

Fixed Issues (if relevant)

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

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Related Pull Requests

Manual testing scenarios (*)

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Questions or comments

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)
• README.md files for modified modules are updated and included in the pull request if any README.md predefined sections require an update
• All automated tests passed successfully (all builds are green)