[IMP] project: always display working calendar
[IMP] project: always display working calendar

Setting the working calendar on a project should
be done in debug mode for now. This is annoying as
it is not a "so delicate" feature and project
manager should be able to do it.
This commit makes the field always visible to ease
project configuration.

Task-1827986

closes odoo/odoo#30193
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo