[FIX] repair: Default value for required selection field

Steps to reproduce the bug:

- On Safari, go to Module Repair
- Create a Repair Order
- Add a new line L
- A default type Add was set
- Set a product P on L

Bug:

The default value was reset

opw:2319954

closes odoo/odoo#57332

X-original-commit: 3aa92c1805f9d47dad4655b3ba49d08c319ef1df
Signed-off-by: Simon Goffin (sig) <sig@openerp.com>

addons/repair/models/repair.py

@@ -607,7 +607,7 @@ class RepairLine(models.Model):
         related='repair_id.currency_id')
     type = fields.Selection([
         ('add', 'Add'),
-        ('remove', 'Remove')], 'Type', required=True)
+        ('remove', 'Remove')], 'Type', default='add', required=True)
     product_id = fields.Many2one(
         'product.product', 'Product', required=True, check_company=True,
         domain="[('type', 'in', ['product', 'consu']), '|', ('company_id', '=', company_id), ('company_id', '=', False)]")