#5171 Fix legend updates by getting rid of the show/hideEvent crash fix

* The crash is instead fixed by getting rid of deleteLater()

ApplicationCode/ProjectDataModel/GridCrossPlots/RimGridCrossPlot.cpp

@@ -1017,7 +1017,8 @@ void RimGridCrossPlot::cleanupBeforeClose()
 
     if ( m_plotWidget )
     {
-        m_plotWidget->deleteLater();
+        m_plotWidget->setParent( nullptr );
+        delete m_plotWidget;
         m_plotWidget = nullptr;
     }
 }