[FIX] sale_timesheet: new line in task description

Task description is a HTML field, therefore the new line should be
defined thanks to a line break.

opw-741240

addons/sale_timesheet/models/procurement.py

@@ -71,7 +71,7 @@ class ProcurementOrder(models.Model):
             'partner_id': self.sale_line_id.order_id.partner_id.id or self.partner_dest_id.id,
             'user_id': self.env.uid,
             'procurement_id': self.id,
-            'description': self.name + '\n',
+            'description': self.name + '<br/>',
             'project_id': project.id,
             'company_id': self.company_id.id,
         })