[FIX] base: typo for default currency rate 1.0
[FIX] base: typo for default currency rate 1.0

Since 7eab8e26 rewrite in saas-10, the rate gotten when no
res.currency.rate was present would be 0 which is not wanted and source
of issues. It should still be 1.0 as previously.

opw-681019
opw-681020
opw-681021

hip-odoo/odoo,hip-odoo/odoo,dfang/odoo,ygol/odoo,dfang/odoo,ygol/odoo,hip-odoo/odoo,hip-odoo/odoo,hip-odoo/odoo,ygol/odoo,hip-odoo/odoo,dfang/odoo,dfang/odoo,ygol/odoo,dfang/odoo,dfang/odoo,ygol/odoo,ygol/odoo,ygol/odoo