MAGETWO-34952: Final cleanup to ensure Core module is properly removed

Author: Bryant Luk

app/code/Magento/Email/composer.json

@@ -7,7 +7,6 @@
         "magento/module-store": "0.42.0-beta11",
         "magento/module-cms": "0.42.0-beta11",
         "magento/module-backend": "0.42.0-beta11",
-        "magento/module-theme": "0.42.0-beta11",
         "magento/module-variable": "0.42.0-beta11",
         "magento/framework": "0.42.0-beta11",
         "magento/magento-composer-installer": "*"