Update broken test assertion from merging https://github.com/silverstripe/silverstripe-assets/pull/162
Update broken test assertion from merging https://github.com/silverstripe/silverstripe-assets/pull/162

silverstripe/silverstripe-asset-admin,open-sausages/silverstripe-assets-gallery,open-sausages/silverstripe-assets-gallery,open-sausages/silverstripe-asset-admin,silverstripe/silverstripe-asset-admin,open-sausages/silverstripe-asset-admin