[FIX] mail: create attachments on the correct record when using the popup editor

Send a message using the popup editor.
Drag and drop an image into the message content.
It will create an attachment for the inlined image.
However it did give a res_model value of mail.message but no res_id;
add_missing_default_value would fill in the res_id from the _context, which is
not the mail_message but the current object on which it applies
(e.g. helpdesk.ticket).
We put the correct res_model along with the res_id.

opw 1903194

closes odoo/odoo#28526

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