[FIX] l10n_nl: set correct VAT codes on fiscal position lines

Before this PR quite a lot of the lines on the fiscal positions
"EU landen", "Niet-EU landen" and "Installatie en Afstandsverkopen"
where mapped wrong, some of the lines even referred to another
tax percentage.

Changes:
- The tax "BTW te vorderen laag (inkopen) 9%" on the product
mapped to the tax to apply named "Inkopen import buiten EU laag 6%",
which should be "Inkopen import buiten EU laag 9%" to correctly
counterpart the taxes. All the other changes where similar,
either invalid tax rates where applied or it mapped to a wrong category.
- "Verkopen/omzet overig diensten" on the product would map to
"Installatie/afstandsverkopen buiten EU" as the VAT to apply.
This should map to "Verkopen export buiten EU".
- Added 3 accounts for Omzet NL handelsgoederen 1,
Omzet NL handelsgoederen 2 and Omzet NL handelsgoederen 3
- Mapped the 3 accounts to the fiscal position
"Installatie en Afstandsverkopen" their relevant lines.
- Removed purchase taxes from fiscal position "Installatie en Afstandsverkopen" .
- Mapped the right taxes to the three fiscal positions their VAT tabels.
- Updated .pot file to add the three extra accounts.

Closes #31403

closes odoo/odoo#32130

Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>