Adjust the client area origin and the client size of the MSW wxStaticBox according...

Adjust the client area origin and the client size of the MSW wxStaticBox according to the guidelines on msdn.microsoft.com/en-us/library/aa511279.aspx.  This is so widgets that are children of the static box will not overlap the label or box borders.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@71595 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775