Call base addSurface explicitly in RimEnsembleSurface ctor

Explicitly invoke RimSurfaceCollection::addSurface when adding
statistic surfaces in RimEnsembleSurface's constructor. This
clarifies method resolution and ensures the correct base class
implementation is used.

ApplicationLibCode/ProjectDataModel/Surfaces/RimEnsembleSurface.cpp

@@ -59,7 +59,7 @@ RimEnsembleSurface::RimEnsembleSurface()
     {
         auto statSurface = new RimEnsembleStatisticsSurface;
         statSurface->setStatisticsType( s );
-        addSurface( statSurface );
+        RimSurfaceCollection::addSurface( statSurface );
     }
 }