AthenaMonitoring: Fix compilation with clang.
operator<< for reference_wrapperMonitored::IMonitoredVariable should be in the Monitored namespace, not GaudiUtils, for ADL to work properly. Fixes a compilation failure with clang.
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operator<< for reference_wrapperMonitored::IMonitoredVariable should be in the Monitored namespace, not GaudiUtils, for ADL to work properly. Fixes a compilation failure with clang.