wxOSX Retina fixes: size wxStaticBitmap and wxBitmapButton properly.

The size is expressed in logical coordinates and needs to use bitmap's
scaled size, otherwise it would appear twice as large in both
dimensions.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@75348 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/generic/statbmpg.h

@@ -60,8 +60,8 @@ public:
 private:
     wxSize GetBitmapSize()
     {
-        return m_bitmap.IsOk() ? wxSize(m_bitmap.GetWidth(), m_bitmap.GetHeight())
-                             : wxSize(16, 16); // this is completely arbitrary
+        return m_bitmap.IsOk() ? m_bitmap.GetScaledSize()
+                               : wxSize(16, 16); // this is completely arbitrary
     }
 
     void OnPaint(wxPaintEvent& event);