[FIX] account: default values of payments (customer/supplier)

In `account.abstract.payment` model,
The `partner_type` and `payment_type` fields had set as default
`supplier` and `outbound`, respectively.

The thing is, the `default_get` method of model `account.payment`
(inheriting on the above model), will keep these default values set,
even if the invoice is customer invoice, which is wrong.

Either, this `default_get` should ignore the current default values,
either, the default values should not be wrong in the first place.

In this revision, I choose the second solution. Therefore, I had
to add the default value `outbound` in the purchase payments
menu action.

opw-641441

addons/account/account_payment.py

@@ -30,12 +30,12 @@ class account_abstract_payment(models.AbstractModel):
     _name = "account.abstract.payment"
     _description = "Contains the logic shared between models which allows to register payments"
 
-    payment_type = fields.Selection([('outbound', 'Send Money'), ('inbound', 'Receive Money')], default='outbound', string='Payment Type', required=True)
+    payment_type = fields.Selection([('outbound', 'Send Money'), ('inbound', 'Receive Money')], string='Payment Type', required=True)
     payment_method = fields.Many2one('account.payment.method', string='Payment Method', required=True)
     payment_method_code = fields.Char(related='payment_method.code',
         help="Technical field used to adapt the interface to the payment method selected.")
 
-    partner_type = fields.Selection([('customer', 'Customer'), ('supplier', 'Supplier')], default='supplier')
+    partner_type = fields.Selection([('customer', 'Customer'), ('supplier', 'Supplier')])
     partner_id = fields.Many2one('res.partner', string='Partner')
 
     amount = fields.Monetary(string='Payment Amount', required=True)

addons/account/views/account_payment_view.xml

@@ -154,7 +154,7 @@
             <field name="res_model">account.payment</field>
             <field name="view_type">form</field>
             <field name="view_mode">tree,form,graph</field>
-            <field name="context">{}</field>
+            <field name="context">{'default_payment_type': 'outbound'}</field>
             <field name="domain">[('partner_type', '=', 'supplier')]</field>
             <field name="view_id" ref="view_account_supplier_payment_tree"/>
             <field name="help" type="html">