TargetSelector: Fix position of "change kit" menu

It didn't handle high resolution button pixmaps well.

Task-number: QTCREATORBUG-16080
Change-Id: I1258c30a0fcd9916708ad348f90b06c0185a2c53
Reviewed-by: Alessandro Portale <alessandro.portale@theqtcompany.com>

src/plugins/projectexplorer/targetselector.cpp

@@ -46,7 +46,7 @@ public:
     QPixmapButton(QWidget *parent, const QPixmap &first, const QPixmap &second)
         : QPushButton(parent), m_showFirst(true), m_first(first), m_second(second)
     {
-        setFixedSize(m_first.size());
+        setFixedSize(m_first.size()/m_first.devicePixelRatio());
     }
 
     void paintEvent(QPaintEvent *)