[IMP] point_of_sale: set values depending on session

Before, when a pos order was created, some of its values were were
completed through the default mechanism that was looking for a session
opened by the current user, which could lead to wrong values when with
recovery session. Since in near future we'll allow one user to open
multiple sessions, this behavior won't work anymore, as you could get
the config od another session than the one you are working on.

We also removed the '_default_session' on field session_id, as the
method 'create_from_ui' which creates the orders from the frontend
allways set the session_id when it creates a new order.

TASK-ID: 2032769

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