Fix wx[Check]ListBox font and margin on DPI change

These control are drawn using a wxDC. When the DPI changes, call SetFont
to update the font of the wxDC. First call wxListBoxBase::SetFont() so
m_font is updated to the new DPI, then use this font in the wxDC.
For wxCheckListBox update the margins to fit the changed checkbox size.

include/wx/msw/checklst.h

@@ -81,6 +81,8 @@ protected:
         ProcessCommand(event);
     }
 
+    virtual void MSWUpdateFontOnDPIChange(const wxSize& newDPI) wxOVERRIDE;
+
     wxSize DoGetBestClientSize() const wxOVERRIDE;
 
     wxDECLARE_EVENT_TABLE();