Mark Activated from TraceOutput as an override of a method from Perfo…

…rmanceMetrics

 /Users/runner/work/ThunderNanoServicesRDK/ThunderNanoServicesRDK/ThunderNanoServicesRDK/PerformanceMetrics/TraceOutput.cpp:161:10: error: 'Activated' overrides a member function but is not marked 'override' [-Werror,-Winconsistent-missing-override]
    void Activated() 
         ^
/Users/runner/work/ThunderNanoServicesRDK/ThunderNanoServicesRDK/ThunderNanoServicesRDK/PerformanceMetrics/PerformanceMetrics.h:104:26: note: overridden virtual function is here
            virtual void Activated()  = 0;
                         ^

PerformanceMetrics/TraceOutput.cpp

@@ -97,7 +97,7 @@ class MetricsTraceOuput : public PerformanceMetrics::IStateMetricsLogger {
         }
     }
 
-    void Activated() 
+    void Activated() override
     {
         if( _memory != nullptr ) {
             TRACE(Trace::Metric, (_T("Plugin %s activated, RSS: %llu"), _callsign.c_str(), _memory->Resident()));