[FIX] email_template: use valid email_from content

Correctly use the email_from tag from template.
This partially reverts commit 0f82346167698fb7349ff16618d1cecf8984cca9.
"[FIX] email_template: keep email_from and outgoing server"
Remove the email_from part that was incorrect, keeping the one on mail_server_id

Instead of assigning an non-evaulated email_from in the context, specify the
email_from in the onchange method. This way the created email has an evaulated
from value. This was an issue for templates using email_from like
"${(object.user_id.email or '')|safe}"

In the _notify method method, the email_from is partially respected as it will
be used a fallback only. However changing that would introduce a modification of
behaviour not suitable for 7.0 branch.

Fixes #8409

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