Simplify and correct setting of initial directory for wxFilePickerCtrl.

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

include/wx/generic/filepickerg.h

@@ -156,10 +156,6 @@ protected:
     void UpdatePathFromDialog(wxDialog *p)
         { m_path = wxStaticCast(p, wxFileDialog)->GetPath(); }
 
-    // Set the initial directory for the dialog but without overriding the
-    // directory of the currently selected file, if any.
-    void DoSetInitialDirectory(wxFileDialog* dialog, const wxString& dir);
-
 private:
     DECLARE_DYNAMIC_CLASS(wxGenericFileButton)
 };