Hi,
By 'Empty Deleted Items Folder' option, do you mean the button available on Quick Access Toolbar?

If this is the case, you can use the 1671 control ID with the Outlook Group Policy settings to achieve the goal.
In addition, we may also consider to use the 18734 control ID to disable the 'Empty Folder' menu when right clicking the Deleted Items folder.

See the following article for the detailed steps about how to use Control IDs to disable Office user interface items:
https://technet.microsoft.com/en-us/library/cc179143.aspx
Hope this helps.
Regards,
Steve Fan
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