[FIX] sale: remove wrong default qty on lines

Compute was never called because of the compute, which lead to wrong
values (raising due to the SQL constraints).

Integrate the default in the compute directly.

addons/sale/models/sale_order_line.py

@@ -250,7 +250,7 @@ class SaleOrderLine(models.Model):
         related="product_id.product_tmpl_id", domain=[('sale_ok', '=', True)])
     product_updatable = fields.Boolean(compute='_compute_product_updatable', string='Can Edit Product')
     product_uom_qty = fields.Float(
-        string='Quantity', digits='Product Unit of Measure', required=True, default=1.0,
+        string='Quantity', digits='Product Unit of Measure', required=True,
         compute='_compute_product_uom_qty', store=True, readonly=False, pre_compute=True)
     product_uom = fields.Many2one(
         'uom.uom', string='Unit of Measure',
@@ -458,8 +458,8 @@ class SaleOrderLine(models.Model):
                 line.product_uom_qty = 0.0
                 continue
 
-            if not line.product_uom or (line.product_id.uom_id.id != line.product_uom.id):
-                line.product_uom_qty = line.product_uom_qty or 1.0
+            # Default value = 1.0
+            line.product_uom_qty = line.product_uom_qty or 1.0
             if not line.product_packaging_id:
                 continue
             packaging_uom = line.product_packaging_id.product_uom_id