fixed exit warning window cancel button

source/ubinstall-gtk.c

@@ -2207,6 +2207,7 @@ gboolean on_yon_exit(GtkWidget *,GdkEvent*, main_window *widgets){
         window->CancelButton = yon_gtk_builder_get_widget(builder,"CancelButton");
         g_signal_connect(G_OBJECT(window->AcceptButton),"clicked",G_CALLBACK(on_exit_accepted),widgets);
         g_signal_connect(G_OBJECT(window->AcceptButton),"clicked",G_CALLBACK(on_subwindow_close),NULL);
+        g_signal_connect(G_OBJECT(window->CancelButton),"clicked",G_CALLBACK(on_subwindow_close),NULL);
         gtk_window_set_transient_for(GTK_WINDOW(window->Window),GTK_WINDOW(widgets->MainWindow));
         gtk_window_set_title(GTK_WINDOW(window->Window),TITLE_LABEL);
         gtk_window_set_icon_name(GTK_WINDOW(window->Window),icon_path);