Bring up, down, top, and bottom icons into XDG compliance

diff --git a/kdirstat/kdirstatapp.cpp b/kdirstat/kdirstatapp.cpp
index 1b24b3c..0103aa5 100644
--- a/kdirstat/kdirstatapp.cpp
+++ b/kdirstat/kdirstatapp.cpp
@@ -183,7 +183,7 @@
 				       TQT_TQOBJECT(this), TQT_SLOT( treemapZoomOut() ),
 				       actionCollection(), "treemap_zoom_out" );
 
-    _treemapSelectParent= new TDEAction( i18n( "Select Parent" ), "up", Key_Asterisk,
+    _treemapSelectParent= new TDEAction( i18n( "Select Parent" ), "go-up", Key_Asterisk,
 				       TQT_TQOBJECT(this), TQT_SLOT( treemapSelectParent() ),
 				       actionCollection(), "treemap_select_parent" );