[FIX] l10n_es: Replace grid 61 by the proper tag on tax templates

Fix https://github.com/odoo/odoo/commit/b40216a8ae8fefd03311b2884e7b83644baac0a1

 was merged though partially ready.

closes odoo/odoo#79005

X-original-commit: 880c32f9
Signed-off-by: Josse Colpaert <jco@openerp.com>
Signed-off-by: Olivier Colson <oco@odoo.com>