Both Cairo0 and Cairo1 accounts should always be predeclared

[FabijanC]

As noted in this Discord thread, when users select --account-class cairo0, only cairo0 is predeclared. When they select --account-class cairo1, both cairo0 and cairo1 are predeclared. This happens because we predeploy the not-for-public-use chargeable account (used in tests), which always uses cairo0 implementation.

Why this could be useful? Users might want to predeploy cairo0 accounts, but later on be able to deploy cairo1 accounts, or vice versa.

Related: #171