odoo/odoo#159466

Created by Discuss, Didier Debondt (did)

Blocked

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label
odoo-dev:master-refactor-starred-message-did
head
98083688d53a538c09876cf47cd2eb9986a525f8
target
master

[IMP] mail: clean up starredPersonas

Before this PR, `_message_format` sent all of the users that starred a message to
the JS code.
Since https://github.com/odoo/odoo/pull/162065, this behavior is not necessary
anymore and a boolean can be used.