Remplace collection_select by select and fill the selected item

+ add tom-select controller

app/views/spree/admin/products/new.html.haml

@@ -11,7 +11,7 @@
           = f.field_container :supplier do
             = f.label :supplier_id, t(".supplier")
             %span.required *
-            = f.collection_select(:supplier_id, @producers, :id, :name, {:include_blank => true, :selected => select_only_item(@producers)}, {:class => "select2 fullwidth"})
+            = f.select :supplier_id, options_from_collection_for_select(@producers, :id, :name, @product.supplier_id), {}, { "data-controller": "tom-select", class: "primary" }
             = f.error_message_on :supplier
         .eight.columns.omega
           = f.field_container :name do