Qt: fix directsound simple prefs

Close #6424
(cherry picked from commit f7f78e8a6d1019a03b86947552dbb26015c93f20)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/gui/qt4/components/simple_preferences.cpp

@@ -294,7 +294,7 @@ SPrefsPanel::SPrefsPanel( intf_thread_t *_p_intf, QWidget *_parent,
 #ifdef WIN32
             audioControl( DirectX );
             optionWidgets.append( DirectXControl );
-            CONFIG_GENERIC_NO_UI( "directx-audio-device-name", StringList,
+            CONFIG_GENERIC_NO_UI( "directx-audio-device", StringList,
                     DirectXLabel, DirectXDevice );
 #elif defined( __OS2__ )
             audioControl( kai );