Bring tablet icon into XDG compliance

diff --git a/chalk/ui/kis_dlg_preferences.cc b/chalk/ui/kis_dlg_preferences.cc
index 5fbe96d..61811d3 100644
--- a/chalk/ui/kis_dlg_preferences.cc
+++ b/chalk/ui/kis_dlg_preferences.cc
@@ -740,7 +740,7 @@
     vbox = addVBoxPage( i18n( "Performance"), i18n( "Performance"), BarIcon( "fork", TDEIcon::SizeMedium ));
     m_performanceSettings = new PerformanceTab ( vbox );
 
-    vbox = addVBoxPage ( i18n( "Tablet" ), i18n( "Tablet" ), BarIcon( "tablet", TDEIcon::SizeMedium ));
+    vbox = addVBoxPage ( i18n( "Tablet" ), i18n( "Tablet" ), BarIcon( "input-tablet", TDEIcon::SizeMedium ));
     m_tabletSettings = new TabletSettingsTab( vbox );
 
     vbox = addVBoxPage ( i18n( "Grid" ), i18n( "Grid" ), BarIcon( "grid", TDEIcon::SizeMedium ));