FreezeableFlag does not seems to be used in freeze and unfrezze

[rya-sge]

The variable FreezableFlag does not seem to be used.

The variable can be removed since the implementation has two distinct functions to freeze and unfreeze tokens.

    #[public]
    fn freeze(user: AztecAddress, value: FreezableFlag) {
        storage.enforcement_module.freeze(context.msg_sender(), user, value, storage.access_control);
    }

  #[public]
   fn unfreeze(user: AztecAddress, value: FreezableFlag) {
       storage.enforcement_module.unfreeze(
           context.msg_sender(),
           user,
           value,
           storage.access_control,
       );
   }