Task #8809: update commented-out filename in CMakeLists.txt for...

Task #8809: update commented-out filename in CMakeLists.txt for ObservationStartListener systemd service file

LCS/MessageDaemons/ObservationStartListener/etc/CMakeLists.txt

 # $Id$
 
 # Do not install this systemd service file, as it must go into a system path.
-#LofarObservationStartListener.service
+#LofarObservationStartListener-dragnet.service