[REF] website_slides: update slide members relationship

This commit changes decorated many2many between slides and participants
recently introduced [1]. It was done between slide and users as people have to
login to have slide information.

Another many2many between channel and partners to store notably completion
and soon add statistics has been added [2]. It has been done between
channels and partners.

In this commit we choose to have the same relationship for slides, aka a link
between slides and partners. It allows to easily compute statistics and find
information based on partner_id.

Co-Authored-By: Quentin Mourrier <qmo@odoo.com>
Co-Authored-By: Thibault Delavallée <tde@odoo.com>

[1] See c273e89d5508a191a0e0f4d011e3283d9fe21615
[2] See 748b9072d645a16373f829013c3170721a931659

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