Marks plot as initialized after creation

Ensures that the plot is marked as fully initialized after all initial setup steps are completed.

ApplicationLibCode/ProjectDataModel/Flow/RimWellRftPlot.cpp

@@ -340,6 +340,8 @@ void RimWellRftPlot::applyInitialSelections( std::variant<RimSummaryCase*, RimSu
 
     createEnsembleCurveSets();
     syncCurvesFromUiSelection();
+
+    m_isInitialized = true;
 }
 
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