adapt rc_local to only run apt-get -y update

tools/rc.local.sh

@@ -6,8 +6,7 @@ for i in /opt/mindstorms/tools/*; do
 	ln -s $i /usr/local/bin/
 done
 
-apt-get update
-apt-get -y install --reinstall gnome-control-center
+apt-get -y update
 
 # copy laboratory documentation
 echo "Copying documentation ..."