[FIX] lunch: Fix unreviewed new feature from a2f69ca

Purpose
=======

As we try to open a mail.compose.message on a model that doesn't inherit
from mail.thread (Mimic a cowboy yellin' "Yihaaa" while shooting into the air
with one revolver in each hand).

Specification
=============

The only way to fix this issue while keeping the feature (Open a
mail composer) is to open the mail composer in mass_mail mode and
to remove the model on which it should be called.

The template won't be rendered in the mail composer but will
be rendered when sending the mass_mailing obviously, while avoiding
the unavoidable traceback when clicking on the 'Send' button

closes odoo/odoo#28849

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