Don't assert if the path is not absolute in wxFileDialog::SetPath().

Remove the assert added in r62101 (see #10917), it was wrong as the other
ports do not assert in this case. Instead, just ensure that the path we use
with the GTK+ native chooser is absolute.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@62769 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/filedlg.cpp

@@ -369,8 +369,11 @@ void wxFileDialog::SetMessage(const wxString& message)
 
 void wxFileDialog::SetPath(const wxString& path)
 {
-    wxCHECK_RET(wxIsAbsolutePath(path), " wxFileDialog::SetPath requires an absolute filepath");
-    m_fc.SetPath( path );
+    // we need an absolute path for GTK native chooser so ensure that we have
+    // it
+    wxFileName fn(path);
+    fn.MakeAbsolute();
+    m_fc.SetPath(fn.GetFullPath());
 }
 
 void wxFileDialog::SetDirectory(const wxString& dir)