[FIX] sale: set 'online signature' to true by default

- set field 'portal_confirmation_sign' to true by default and removed from demo data where it sets to true.

before this commit:
   without demo data 'online signature' setting is false by default.

after this commit:
   'online signature' setting is true by default with or without demo data.

Related to Issue: 1946116

closes odoo/odoo#32360

Signed-off-by: Damien Bouvy (dbo) <dbo@odoo.com>

addons/sale/data/sale_demo.xml

@@ -4,7 +4,6 @@
 
         <!-- We want to activate pay and sign by default for easier demoing. -->
         <record id="base.main_company" model="res.company">
-            <field name="portal_confirmation_sign" eval="True"/>
             <field name="portal_confirmation_pay" eval="True"/>
         </record>
 

addons/sale/models/res_company.py

@@ -7,7 +7,7 @@ from odoo import api, fields, models, _
 class ResCompany(models.Model):
     _inherit = "res.company"
 
-    portal_confirmation_sign = fields.Boolean(string='Online Signature')
+    portal_confirmation_sign = fields.Boolean(string='Online Signature', default=True)
     portal_confirmation_pay = fields.Boolean(string='Online Payment')
     quotation_validity_days = fields.Integer(default=30, string="Default Quotation Validity (Days)")