Make it possible to set color of QStaticText with pixel size >= 64

Adding the fallback to QPainterPath for large QStaticTexts created a
regression where all text would be painted in black regardless of the
color you set on it. The color in QStaticTextItem is sometimes invalid,
in which case the current painter color should be used. In either case,
the color is already set on the current pen when entering
drawStaticTextItem() so we can just use that.

Task-number: QTBUG-19950
Reviewed-by: Jiang Jiang
(cherry picked from commit ee77ee5c25f58271e6f2863225d08573da86c3ee)

Change-Id: I955aa6526e5b14589430f8dccd006a9de9ae08c9
Reviewed-on: http://codereview.qt.nokia.com/491
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@nokia.com>

src/gui/painting/qpaintengineex.cpp

@@ -1084,7 +1084,7 @@ void QPaintEngineEx::drawStaticTextItem(QStaticTextItem *staticTextItem)
             changedHints = true;
         }
 
-        fill(qtVectorPathForPath(path), staticTextItem->color);
+        fill(qtVectorPathForPath(path), s->pen.color());
 
         if (changedHints) {
             s->renderHints = oldHints;