Modernize.

Apparently this is possible, and Qt Creator complains about returning
the rect the old-fashioned way...

libs/ui/tool/kis_tool.cc

@@ -292,11 +292,12 @@ QPointF KisTool::pixelToView(const QPointF &pixelCoord) const
 
 QRectF KisTool::pixelToView(const QRectF &pixelRect) const
 {
-    if (!image())
+    if (!image()) {
         return pixelRect;
+    }
     QPointF topLeft = pixelToView(pixelRect.topLeft());
     QPointF bottomRight = pixelToView(pixelRect.bottomRight());
-    return QRectF(topLeft, bottomRight);
+    return {topLeft, bottomRight};
 }
 
 QPainterPath KisTool::pixelToView(const QPainterPath &pixelPolygon) const