Remove remaining nginx removal cruft.

* modules/meetbot/manifests/init.pp: Remove a stray ensure absent
block for nginx configuration which tries to notify a nonexistent
service.

Change-Id: I4a086ea60afb777b72971b81ece3d53b99b29ff2
Reviewed-on: https://review.openstack.org/29863
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Approved: James E. Blair <corvus@inaugust.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins