Fix sample_data by filtering params for products

We were passing too many parameters to the product creation. Rails 5.2
complained that products don't have a distributor. Filtering the
parameters helps.

lib/tasks/sample_data/product_factory.rb

@@ -60,7 +60,7 @@ module SampleData
 
     def create_product(hash)
       log "- #{hash[:name]}"
-      params = hash.merge(
+      params = hash.slice(:name, :price).merge(
         supplier_id: hash[:supplier].id,
         primary_taxon_id: hash[:taxons].first.id,
         variant_unit: "weight",