Add simple fix for Grid Cross plot as well

* TODO:  make sure the methods in RimSummaryPlot and RimGridCrossPlot are called when using the generic virtual method in RimPlotInterface.
* This requires a bit of thought, since they have parameters which the generic version does not have

ApplicationCode/Commands/ApplicationCommands/RicShowPlotDataFeature.cpp

@@ -152,7 +152,7 @@ public:
     virtual QString tabText( int tabIndex ) const override
     {
         CVF_ASSERT( m_crossPlot.notNull() && "Need to check that provider is valid" );
-        return m_crossPlot->asciiDataForPlotExport( tabIndex );
+        return m_crossPlot->asciiDataForGridCrossPlotExport( tabIndex );
     }
 
     virtual int tabCount() const override