View file PF.Base/module/comment/install/version/3.1.0rc1.xml.php

<upgrade>
	<user_group_settings>
		<setting>
			<is_admin_setting>0</is_admin_setting>
			<module_id>comment</module_id>
			<type>boolean</type>
			<admin>0</admin>
			<user>0</user>
			<guest>0</guest>
			<staff>0</staff>
			<module>comment</module>
			<ordering>0</ordering>
			<value>can_delete_comment_on_own_item</value>
		</setting>
	</user_group_settings>
</upgrade>