* use add_file instead of add_string for skins2-last - this fixes QT interface simple prefs

modules/gui/skins2/src/skin_main.cpp

@@ -445,8 +445,8 @@ static int onTaskBarChange( vlc_object_t *pObj, const char *pVariable,
 vlc_module_begin();
     set_category( CAT_INTERFACE );
     set_subcategory( SUBCAT_INTERFACE_MAIN );
-    add_string( "skins2-last", "", NULL, SKINS2_LAST, SKINS2_LAST_LONG,
-                VLC_TRUE );
+    add_file( "skins2-last", "", NULL, SKINS2_LAST, SKINS2_LAST_LONG,
+              VLC_TRUE );
         change_autosave();
     add_string( "skins2-config", "", NULL, SKINS2_CONFIG, SKINS2_CONFIG_LONG,
                 VLC_TRUE );