[FIX] base: on partner kanban, show company default image if contact has none

For contract of type 'Company' which have no image set, we should display a
specific default 'company' placeholder image instead of default placeholder.
This allows to easily identify which records are companies.

This was already the case up to commit 6153d656

OPW-2067475

closes odoo/odoo#36783

X-original-commit: 42c08846
Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>