Make file transfer window non-transient (Issue #109)

In order to be able to raise it without raising the related thunar
window.

thunar/thunar-progress-dialog.c

@@ -96,7 +96,6 @@ thunar_progress_dialog_init (ThunarProgressDialog *dialog)
   gtk_window_set_title (GTK_WINDOW (dialog), _("File Operation Progress"));
   gtk_window_set_default_size (GTK_WINDOW (dialog), 450, 10);
   gtk_window_set_modal (GTK_WINDOW (dialog), FALSE);
-  gtk_window_set_transient_for (GTK_WINDOW (dialog), NULL);
   gtk_window_set_destroy_with_parent (GTK_WINDOW (dialog), FALSE);
   gtk_window_set_type_hint (GTK_WINDOW (dialog), GDK_WINDOW_TYPE_HINT_DIALOG);