[FIX] website_sale_delivery: allow to restrict delivery to a website

Before this commit, website_id field would not be added in form view, making it
impossible to set a website on a delivery method and so impossible to restrict
a delivery method to a specific website.

Now, adding this field will be enough as we already search() on
website_published carrier and the delivery.carrier model has the
'website.published.multi.mixin' mixin that will filter accessible website when
searching on website_published field.

+ add missing groups on website_id field
+ remove useless website_published

opw-1918189

closes odoo/odoo#29749

addons/website_blog/views/website_blog_views.xml

@@ -47,7 +47,7 @@
                     <field name="name"/>
                     <field name="active" invisible="1"/>
                     <field name="blog_id"/>
-                    <field name="website_id"/>
+                    <field name="website_id" groups="website.group_multi_website"/>
                     <field name="visits"/>
                     <field name="create_uid" invisible="1"/>
                     <field name="write_uid"/>

addons/website_sale_delivery/models/delivery.py

@@ -9,4 +9,3 @@ class DeliveryCarrier(models.Model):
     _inherit = ['delivery.carrier', 'website.published.multi.mixin']
 
     website_description = fields.Text(related='product_id.description_sale', string='Description for Online Quotations', readonly=False)
-    website_published = fields.Boolean(default=False)

addons/website_sale_delivery/models/sale_order.py

@@ -75,6 +75,7 @@ class SaleOrder(models.Model):
 
     def _get_delivery_methods(self):
         address = self.partner_shipping_id
+        # searching on website_published will also search for available website (_search method on computed field)
         return self.env['delivery.carrier'].sudo().search([('website_published', '=', True)]).available_carriers(address)
 
     @api.multi

addons/website_sale_delivery/views/website_sale_delivery_views.xml

@@ -6,6 +6,9 @@
         <field name="model">delivery.carrier</field>
         <field name="inherit_id" ref="delivery.view_delivery_carrier_form"/>
         <field name="arch" type="xml">
+            <field name="company_id" position='after'>
+                <field name="website_id" groups="website.group_multi_website" options="{'no_open': True, 'no_create_edit': True}"/>
+            </field>
             <xpath expr="//page[@name='destination']" position='after'>
                 <page string="Description">
                     <field name="website_description"  placeholder="Description displayed on the eCommerce and on online quotations."/>
@@ -26,6 +29,7 @@
         <field name="arch" type="xml">
             <field name="delivery_type" position="after">
                 <field name="website_published"/>
+                <field name="website_id" groups="website.group_multi_website"/>
             </field>
         </field>
     </record>