[FIX] account: Fix price_unit with fiscal position to price included tax

Suppose two price_included taxes: 10%, 20%, a product having a sale price of 110.0 and a fiscal position tax 10% => tax 20%:

When onchange_product_id is called, the price_unit is computed as follow:
110 / 1.1 = 100
100 * 1.2 = 120
So price_unit = 120 and balance = 100.0

But in onchange_uom_id, we do the same thing and we call _get_fields_onchange_balance_model with balance=100.0.
However, in this method, an empty dictionary is returned because price_subtotal == balance.
Then, {}.get('price_unit', price_unit) will return the original price_unit (110.0) instead of the new computed one (120.0).

closes odoo/odoo#59888

X-original-commit: 2324599b1d54b5fff1f8baea4ec7455fc0293fcc
Signed-off-by: oco-odoo <oco-odoo@users.noreply.github.com>
Signed-off-by: Laurent Smet <smetl@users.noreply.github.com>

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