[FIX] mail: Fallback to default company logo instead of odoobot

For some specific report (i.e account followup report) the mail_message
sent will contains no company informations because it will be sent on
the partner context, so when generating the template the logo will be
retrieved from the route /logo.png?company=False which yield back the
odoo company logo.

Adding a default 0 allow to retrieve the company logo for the current
user

opw-2232184

closes odoo/odoo#49787

X-original-commit: eea99fe1
Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>