Revert "Always render the listing on categories by default"

[royduin]

Reverts #749, as without changing the categories to actually be anchors you'll end up with an empty page. For the test and demo environments I added this to the deploy scripts:

# Make sure all categories are anchors
$FORGE_PHP artisan tinker --execute="DB::update('UPDATE catalog_category_entity_int SET value = 1 WHERE attribute_id = 54')"
# Hide categories without products
$FORGE_PHP artisan tinker --execute="DB::update('UPDATE catalog_category_entity_int SET value = 0 WHERE attribute_id = 69 AND entity_id IN (37, 38)')"
docker exec MAGENTO-CONTAINER bin/magento cache:clean
docker exec MAGENTO-CONTAINER bin/magento indexer:reindex