Add back default parameter value for IncusClient list function

[vheon]

Here https://github.com/kmpm/ansible-collection-incus/commit/8a67494227c24b7c677bb91bee3d2a9642582543#diff-200f3210b107b41966771591776595947c443cad9cdc394a569c3c5c63bf0c0eL171-R165 while removing type hints the default value was removed as well.