Alrighty figured it out… Basically, remove it via a user's AVM directory. Once you remove it, you can go back into the Alfresco UI and select the webapp folder that you just deleted from the dropdown box. Now select the user's Sandbox/Modified Items and Submit the change. Now wait… (positively the most ridiculous "feature" I've ever seen put into an application)… then wait some more… keep hitting "Refresh" to view the Snapshots… once you see the new Snapshot, you can relogin and the dropdown "Webapp folder" box will be gone.