Direct2D QPA: Correctly set active state in paint engine

Change-Id: I4eea073ad11ba8684212258b344c1f237598a9c5
Reviewed-by: Risto Avila <risto.avila@digia.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>

src/plugins/platforms/direct2d/qwindowsdirect2dpaintengine.cpp

@@ -874,6 +874,7 @@ bool QWindowsDirect2DPaintEngine::begin(QPaintDevice * pdev)
 
     D2D_TAG(D2DDebugDrawInitialStateTag);
 
+    setActive(true);
     return true;
 }