In build.xml youc an see below statment
<!-- Start Demo (Eclipse) -->
<target name="start.demo.eclipse" depends="start.eclipse,start.human.task" />
remove starty.human.task dependency whcih will not start the human task.
As you are not working human task you can remove jbpm-human-task-war.war from Jboss deployment folder
Let me know if this works.