Revert "Fix post-deploy mode"

This fix was premature as it completely ignores
the previously-respected umask.

Let's discuss a proper fix and revert this one
since CI is fixed elsewhere [1].

[1] https://review.opendev.org/743502

This reverts commit 87efdce24b.

Change-Id: If38adbf124e793574a21ae986f9ee146d587f820

ansible/post-deploy.yml

@@ -7,5 +7,4 @@
       template:
         src: "roles/common/templates/admin-openrc.sh.j2"
         dest: "{{ node_config }}/admin-openrc.sh"
-        mode: 0644
       run_once: True

releasenotes/notes/bug-1891145-95e3943e8e030962.yaml

@@ -1,5 +0,0 @@
----
-fixes:
-  - |
-    Fixes ``post-deploy`` action with new Ansible releases setting a wrong mode
-    on the created file. `LP#1891145 <https://launchpad.net/bugs/1891145>`__