Create wxFileDialog with correct initial directory and default file name from the very beginning instead of updating it later. This makes the code simpler and also actually makes it work as the initial directory setting was overwritten by setting the default path later even if it didn't contain any directory component. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72451 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775