[FIX] stock: preserve context in scrap wizards

Context was overwritten in the wizard warning for insufficient
quantity when trying to scrap a componenent from a MO. This had a
side-effect on the move creation of the scrap where the move was
not linked to the MO, thus ignored by the cost analysis report.

closes odoo/odoo#36563

Tasks: BugLogistics
Signed-off-by: Simon Lejeune (sle) <sle@openerp.com>

addons/stock/models/stock_scrap.py

@@ -166,17 +166,19 @@ class StockScrap(models.Model):
         if float_compare(available_qty, scrap_qty, precision_digits=precision) >= 0:
             return self.do_scrap()
         else:
+            ctx = dict(self.env.context)
+            ctx.update({
+                'default_product_id': self.product_id.id,
+                'default_location_id': self.location_id.id,
+                'default_scrap_id': self.id
+            })
             return {
                 'name': _('Insufficient Quantity'),
                 'view_mode': 'form',
                 'res_model': 'stock.warn.insufficient.qty.scrap',
                 'view_id': self.env.ref('stock.stock_warn_insufficient_qty_scrap_form_view').id,
                 'type': 'ir.actions.act_window',
-                'context': {
-                    'default_product_id': self.product_id.id,
-                    'default_location_id': self.location_id.id,
-                    'default_scrap_id': self.id
-                },
+                'context': ctx,
                 'target': 'new'
             }