Revert "Qt4: don't show unsaveable playlist-enqueue option in the simple prefs"

This reverts commit f2564c11.

modules/gui/qt4/components/simple_preferences.cpp

@@ -575,10 +575,8 @@ SPrefsPanel::SPrefsPanel( intf_thread_t *_p_intf, QWidget *_parent,
             /* ONE INSTANCE options */
 #if defined( WIN32 ) || defined( HAVE_DBUS ) || defined(__APPLE__)
             CONFIG_GENERIC( "one-instance", Bool, NULL, OneInterfaceMode );
-#if 0
             CONFIG_GENERIC( "playlist-enqueue", Bool, NULL,
                     EnqueueOneInterfaceMode );
-#endif
             ui.EnqueueOneInterfaceMode->setEnabled( ui.OneInterfaceMode->isChecked() );
             CONNECT( ui.OneInterfaceMode, toggled( bool ),
                      ui.EnqueueOneInterfaceMode, setEnabled( bool ) );