Refresh the toolbar after changing tool placing value.

After changing padding for toolbar in SetToolPacking() there is necessary to refresh/recalculate the toolbar to reflect new padding.

src/msw/toolbar.cpp

@@ -1637,6 +1637,7 @@ void wxToolBar::SetToolPacking(int packing)
             ::SendMessage(GetHWND(), TB_SETPADDING, 0, MAKELPARAM(0, m_toolPacking));
         else
             ::SendMessage(GetHWND(), TB_SETPADDING, 0, MAKELPARAM(m_toolPacking, 0));
+        Realize();
     }
 }