Spaces - re-jigger application name for new Spaces application

Summary: got some errors in my sandbox when I updated. this fixes them and I think is the right naming convention.

Test Plan: /settings/panel/emailpreferences/ started working again! /spaces/ also loaded unit tests passed without errors

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T8377

Differential Revision: https://secure.phabricator.com/D13103