[FIX] l10n_nl: BTW af te dragen verlegd has wrong sign for 5b line

Original fix pr 50432.  It forgot the BTW verlegd itself.

closes odoo/odoo#52067

Task-id: 2230389
X-original-commit: 4f06fe0d
Signed-off-by: oco-odoo <oco-odoo@users.noreply.github.com>
Signed-off-by: Josse Colpaert <jco@openerp.com>