Change the argument to the Xsession to be the Exec= line of the .desktop
    
    Tue Jun 10 15:57:39 2003  George Lebl <jirka@5z.com>
    
    	* daemon/slave.c, config/Xsession.in: Change the argument to the
    	  Xsession to be the Exec= line of the .desktop and not the .desktop,
    	  that was kind of silly in retrospect.  We still pass the desktop,
    	  but it's kind of secret since I don't want people to depend on this
    	  second argument.  Also update the comments inside the Xsession
    	  to reflect what's really going on.