QmlProfiler: fix repaint issues in timeline overview

Change-Id: I4db50cd61dd5c9741168a06831d08a3b54801ac6
Reviewed-by: Kai Koehne <kai.koehne@nokia.com>

src/plugins/qmlprofiler/qml/Overview.qml

@@ -87,10 +87,10 @@ Canvas2D {
 
     // ***** slots
     onDrawRegion: {
-        if (dataAvailable)
+        Plotter.qmlEventList = qmlEventList;
+        if (dataAvailable) {
             Plotter.plot(canvas, ctxt, region);
-        else {
-            Plotter.qmlEventList = qmlEventList;
+        } else {
             Plotter.drawGraph(canvas, ctxt, region)    //just draw the background
         }
     }