[FIX] mass_mailing: correctly find partner email in mass mailing

In mass mailing access to partners when performing a mass mailing has been
done in batch to speedup computation [1]. Emails are put into a dictionary
allowing to find back the email based on partner_id.

However the matching between the partner and its emails is done using a
shortcut using the current document ID as partner ID. It works when performing
a mass mailing on partners but fails when performing a mass mailing on models
having message_get_default_recipients not returning only emails. Currently
in saas-14 main models return only emails (crm, event, mailing contacts) but
other models may encounter issues (applicants, tickets).

This commit fixes it by correctly matching partner id and its found email.

[1] See 65ed4553a50fdbefc986b7d21f87a81c42b743c7

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