Instead of doing the difference between output tax and input tax, the tax report was doing the sum. This commit fixes this computation without revamping the rest of the report closes odoo/odoo#88774 X-original-commit: df0372a168db184c03fd901359fec6abd08f5bdd Signed-off-by: Olivier Colson <oco@odoo.com> Signed-off-by: Wala Gauthier (gawa) <gawa@odoo.com>