[FIX] stock: inventory on category

- Create a product category A
- Create a product category A1
- Add a product in A1
- Launch an inventory adjustment on A, and select 'Exhausted Products'

All products (even from other categories) are included.

Since there is no product found in the category `products_to_filter`
and `quant_products` are empty. Therefore, we fall back on
`[('id', 'not in', [])]`, which selects everything.

The root cause is that we don't include child categories. There is no
real point of doing so.

opw-1932192

closes #31322

addons/stock/models/stock_inventory.py

@@ -267,7 +267,7 @@ def _get_inventory_lines_values(self):
             args += (self.package_id.id,)
         #case 5: Filter on One product category + Exahausted Products
         if self.category_id:
-            categ_products = Product.search([('categ_id', '=', self.category_id.id)])
+            categ_products = Product.search([('categ_id', 'child_of', self.category_id.id)])
             domain += ' AND product_id = ANY (%s)'
             args += (categ_products.ids,)
             products_to_filter |= categ_products