base_vat: Correct management of the check of peruvian VAT without prefix.
l10n_pe: Correct income account the last one is not correct.
l10n_pe: Forced Round globally for peruvian companies once l10n_pe is
installed, and with the onchange.
l10n_pe: For peruvian companies it does not make sense a sequence per
year and the year in the prefix is incorrect, we must force XXX- as
a sequence prefix.
closes odoo/odoo#38854
Forward-port-of: #38764
Signed-off-by: Josse Colpaert <jco@openerp.com>