ImscpBoxBilling: Updated according last i-MSCP plugin API +++

    [feedquote='i-MSCP Github (plugins) (nuxwin)','https://github.com/i-MSCP/plugins/commit/c307e90256af0985b5b9909f9b09cfe418db7dd7']

    Code
    1. ImscpBoxBilling: Updated according last i-MSCP plugin API +++

    [/feedquote]