GeometryWriter: fixed the the way Calo DD manager is accessed
GeometryWriter
needs to access Calo DD manager at initialization, hence
it cannot use condition handles for this. The code was modified such that
GeometryWriter
now builds its own copy of the Calo DD manager. This is
not the most optimal implementation, but given the specifics of
GeometryWriter
usage, it still looks much simpler than doing some
major code refactoring.
CC @lshi