[FIX] mrp_subcontracting: show lot name

Usecase:
- Set details operations on picking type
- Create a receipt for a subcontracted product with tracked components
- Records production
- Go to details operations

The move line is created however the lot name is invisible.
It happens due to produce_wizard line creation. It will set the lot_id
but the field lot_id is invisible if the picking type use the option
'use_create_lot' and uncheck 'use_exisiting_lot'

In order to fix it set both lot_name and lot_id after the produce
operation.

addons/mrp_subcontracting/wizard/mrp_product_produce.py

@@ -43,6 +43,7 @@ class MrpProductProduce(models.TransientModel):
                 'product_uom_id': self.product_uom_id.id,
                 'qty_done': self.qty_producing,
                 'lot_id': self.finished_lot_id and self.finished_lot_id.id,
+                'lot_name': self.finished_lot_id and self.finished_lot_id.name,
             })
             if not self._get_todo(self.production_id):
                 ml_reserved = self.subcontract_move_id.move_line_ids.filtered(lambda ml: