example playbooks: ipaselfservice examples mentioned ipadelegation.

The example playbooks for ipaselfservice were using the wrong module,
ipadelegation. This patch changes the references from ipadelegation
to ipaselfservice on these example playbooks.

Also, the attributes were changed, so the same attributes are used
throughout the examples.

playbooks/selfservice/selfservice-absent.yml

@@ -1,11 +1,11 @@
 ---
-- name: Delegation absent
+- name: Selfservice absent
   hosts: ipaserver
   become: true
 
   tasks:
-  - name: Ensure delegation "basic manager attributes" is absent
-    ipadelegation:
+  - name: Ensure selfservice "basic manager attributes" is absent
+    ipaselfservice:
       ipaadmin_password: SomeADMINpassword
       name: "basic manager attributes"
       state: absent