[FIX] website: fix metadata open graph site name

This commit fixes the 'og:site_name' metadata, which previously
defaulted to the company name (see [1]), causing issues for multi-site
setups. Now, the metadata actually uses the site name.

Steps to reproduce:

- Navigate to any page
- Right-click and select "View Page Source"
- In the <head> section, observe the meta property "og:site_name" set to
  "MyCompany".

[1]: https://github.com/odoo/odoo/commit/156955de6b4e6288ac606d29b843081842154eff

opw-3791082

closes odoo/odoo#161123

X-original-commit: 24ea3ca4b12f8dd4103a650436a144e776b81d83
Signed-off-by: Romain Derie (rde) <rde@odoo.com>

addons/website/models/mixins.py

@@ -46,6 +46,7 @@ class SeoMetadata(models.AbstractModel):
         self.ensure_one()
         company = request.website.company_id.sudo()
         title = (request.website or company).name
+        site_name = title
         if 'name' in self:
             title = '%s | %s' % (self.name, title)
 
@@ -55,7 +56,7 @@ class SeoMetadata(models.AbstractModel):
         default_opengraph = {
             'og:type': 'website',
             'og:title': title,
-            'og:site_name': company.name,
+            'og:site_name': site_name,
             'og:url': url_join(request.httprequest.url_root, url_for(request.httprequest.path)),
             'og:image': request.website.image_url(request.website, img_field),
         }