[IMP] base: specify placeholder for company partners

set the specify placeholder for company partners from 'placeholder.png' to 'company_image.png'

After this commit, in the res.partner kanban view, if the company image of an individual is not set,
it will be shown as the 'company_image.png'(a company logo) rather than the 'plaeholder.png'(a camera logo).

closes odoo/odoo#68994

Taskid: 2491161
Signed-off-by: Arnaud Joset <arj-odoo@users.noreply.github.com>

odoo/addons/base/models/res_partner.py

@@ -1003,6 +1003,11 @@ class Partner(models.Model):
     def _get_country_name(self):
         return self.country_id.name or ''
 
+    def _get_placeholder_filename(self, field=None):
+        if self.is_company:
+            return '/base/static/img/company_image.png'
+        return super()._get_placeholder_filename(field)
+
 
 class ResPartnerIndustry(models.Model):
     _description = 'Industry'