The DrupalMediaLibrary class uses the $moduleExtensionList property when the parent class has the $moduleList for the same purpose

The DrupalMediaLibrary class has the $moduleExtensionList property, while its parent class has the $moduleList property. Both the properties are used to contain an instance of the extension.list.module service.

The $moduleExtensionList property must be removed.
The DrupalMediaLibrary class needs to use:

• The $moduleList property
• The CKEditorPluginBase::getModulePath() method