cloud: don't try to override default sync location

For the cloud base image there is no need to override the default
vagrant sync location. /vagrant/ works just fine and is what people
expect.

Signed-off-by: Dusty Mabe <dusty@dustymabe.com>

fedora.conf

@@ -353,9 +353,6 @@ image_build = {
                     'subvariant': 'Cloud_Base',
                     'failable': ['*'],
             },
-            'factory-parameters': {
-                    'vagrant_sync_directory': '/home/vagrant/sync',
-            }
         },
         {
             'image-build': {