[FIX] mrp_repair: default location in multi-company

1. Create a new company
2. Create a user with access to this company and with access to repair
3. Connect as the new user
4. Try to create a new repair and the stock.warehouse access error
   should appear

opw-769160

addons/mrp_repair/models/mrp_repair.py

@@ -15,7 +15,7 @@ class Repair(models.Model):
 
     @api.model
     def _default_stock_location(self):
-        warehouse = self.env.ref('stock.warehouse0', raise_if_not_found=False)
+        warehouse = self.env['stock.warehouse'].search([], limit=1)
         if warehouse:
             return warehouse.lot_stock_id.id
         return False