QRasterPaintEngine: properly initialize flags

QRasterPaintEngineState::flags.non_complex_pen was not initialized in
the ctor which leads to valgrind warnings. Initialize it to false - the
correct value is set within update/ensurePen() before it is really used.

Task-number: QTBUG-66615
Change-Id: If154873ad89903c243662ab1f140f74434a6f88c
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>

src/gui/painting/qpaintengine_raster.cpp

@@ -641,6 +641,7 @@ QRasterPaintEngineState::QRasterPaintEngineState()
     txscale = 1.;
 
     flags.fast_pen = true;
+    flags.non_complex_pen = false;
     flags.antialiased = false;
     flags.bilinear = false;
     flags.legacy_rounding = false;