[FIX] account: remove label on invoices if the tax is in a group
[FIX] account: remove label on invoices if the tax is in a group

- Create a tax of type "Fixed".
- Put some name in its 'Label on Invoices' field.
- Change the type to "group of taxes".
The view hides the field Label on Invoices, since it doesn't make sense
any more. However, it doesn't actually remove the label on invoices.
As a result in the taxes list you can still see the old label on invoice
information, this behaviour misleading.

We modify an existing onchange to avoid that unfortunate situation.

opw-2115984

closes odoo/odoo#40346

X-original-commit: 1aea26c72d451e13754e911a6bb74fff0e2578df
Signed-off-by: Jorge Pinna Puissant (jpp) <52c05351c1e024f822a0ec03b4a6cce073666ac8@odoo.com>

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