DARK: Themes fix the product page (#431)

## JIRA Ticket

[YSHOP2-X](https://youcanshop.atlassian.net/browse/YSHOP2-X)

## QA Steps

- [ ] `pnpm i`
- [ ] `pnpm dev`

## Note
fix the product page to display the product instead of just a
placeholder

sections/product.liquid

@@ -17,13 +17,18 @@
 <section class='product_customization-{{ id }}'>
   {%- assign selected_product = section.settings.product -%}
 
+  {%- if product -%}
+    {%- assign selected_product = product -%}
+  {%- endif -%}
+
   {%- if selected_product -%}
     {%- render 'single-product', product: selected_product, section: section -%}
   {%- else -%}
     {%- render 'single-product-placeholder', section: section, id: id -%}
-  {%- endif %}
+  {%- endif -%}
 </section>
 
+
 {%- schema -%}
 {
   "limit": 1,