Only update the size if the parent is a frame and the frame is

managing the size of this toolbar, otherwise assume that something
else (like a sizer) is managing the layout of this toolbar and leave
it alone.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@36866 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775