The lists of supported currencies by payment provider are displayed on
the form view and are editable, because our list may not be up-to-date.
Empty lists stand for "no filtering" on the payment providers to access
payment methods.
task-2926016
closesodoo/documentation#2788
Related: odoo/enterprise#34158
Related: odoo/odoo#101018
Related: odoo/upgrade#4069
Signed-off-by: Antoine Vandevenne (anv) <anv@odoo.com>