[FIX] base: default rate
[FIX] base: default rate

We set the default rate to be 1.0 instead of 0.0, since a rate of 0.0
doesn't make sense.

Partial backport of 298491597cf30418d5e0355eef1fdb12289171e4

opw-1949866

closes odoo/odoo#31866

Signed-off-by: Nicolas Martinelli (nim) <771435c469f83f6aa9c405ac5e1ed06314a94f2d@odoo.com>
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo