fix(kit_creation): Fix tests

Author: Olexii Kasianenko

app/views/line_items/_line_item_fields.html.erb

@@ -16,6 +16,7 @@
             <%= field.input :item_id,
                             disabled: requested.present?,
                             collection: @item_labels_with_quantities || @items, prompt: "Choose an item",
+                            include_blank: "",
                             label: false,
                             input_html: { class: "my-0 line_item_name", "data-controller": "select2" } %>
             <% if requested.present? %>