[FIX] point_of_sale: restrict price control

- Activate the Price Control option in the POS
- Connect as Admin => you are allowed to modify the price
- Switch the user to Demo => you are still allowed to modify the price
- Switch back to Admin => you are not allowed to modify the prices

The two last steps are clearly incorrect.

The reason is the following.
The function `applyAccessRights` is bound to `'change:cashier'` event of
the `pos` at:

https://github.com/odoo/odoo/blob/d25719cdf2b8a863c1a855f2e42e9c3a43580f66/addons/point_of_sale/static/src/js/screens.js#L389

When switching the user, 2 steps are performed:
1. Set the cashier on the `pos`
2. Set the cashier on the `pos.db`

https://github.com/odoo/odoo/blob/d25719cdf2b8a863c1a855f2e42e9c3a43580f66/addons/point_of_sale/static/src/js/models.js#L646-L647

Step 1 will trigger the function `applyAccessRights`, which calls
`pos.get_cashier`. However, the latter retrieves the user on `pos.db`
first, and falls back on `pos`.

https://github.com/odoo/odoo/blob/d25719cdf2b8a863c1a855f2e42e9c3a43580f66/addons/point_of_sale/static/src/js/models.js#L642

This means that we retrieve the cashier in the `pos.db` before it is
actually set (in step 2).

To avoid this, we explicitly retrieve the cashier on the `pos`, then
fall back on the usual `pos.get_cashier` function.

Closes #26814
opw-1871189
opw-1881172

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