[FIX] product: removal of hardcoded value in product template

Steps to reproduce:
- install sales
- activate units of measures and variants
- set imperial units under general settings (pounds for weight and ft³ for volume)
- create at least 2 variants on a product and access them via the smart button
from product.template

Previous behavior:
the volume remains in m³, it is hardcoded in the template

Current behavior:
the volume is printed just like the weight (generic uom notation)

opw-2186965

closes odoo/odoo#44777

X-original-commit: d7f2beac5ff856afeb684be4b13317838a0257a1
Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>

addons/product/views/product_views.xml

@@ -251,7 +251,7 @@
                                 <label for="volume"/>
                                 <div class="o_row">
                                     <field name="volume"/>
-                                    <span>m³</span>
+                                    <span><field name="volume_uom_name"/></span>
                                 </div>
                                 <label for="weight"/>
                                 <div class="o_row">