openstack-afs.yaml : correct indentation

This was found by the linter

Change-Id: I91f8b9264b17a27855942c5e375d81ce0b1c99d9

playbooks/publish/openstack-afs.yaml

@@ -1,17 +1,16 @@
 - hosts: localhost
   pre_tasks:
-
-  # Note that "{{ afs.path }}" is a valid afs_target and thus
-  # afs_subpath can be empty, we need this for openstack-manuals
-  # publishing.
-  - name: Set default afs_subpath
-    set_fact:
-      our_afs_subpath: "/{{ zuul.project.short_name }}"
-    when: afs_subpath is not defined
-  - name: Use defined afs_subpath
-    set_fact:
-      our_afs_subpath: "{{ afs_subpath }}"
-    when: afs_subpath is defined
+    # Note that "{{ afs.path }}" is a valid afs_target and thus
+    # afs_subpath can be empty, we need this for openstack-manuals
+    # publishing.
+    - name: Set default afs_subpath
+      set_fact:
+        our_afs_subpath: "/{{ zuul.project.short_name }}"
+      when: afs_subpath is not defined
+    - name: Use defined afs_subpath
+      set_fact:
+        our_afs_subpath: "{{ afs_subpath }}"
+      when: afs_subpath is defined
 
   roles:
     - role: create-afs-token