clean up setup author metadata/bot ignore (ansible#58529)

Author: nitzmahone

.github/BOTMETA.yml

@@ -490,7 +490,6 @@ files:
   $modules/system/selinux.py: samdoran
   $modules/system/service.py: $team_ansible
   $modules/system/setup.py:
-    ignored: david_obrien
     maintainers: $team_ansible
   $modules/system/solaris: *solaris
   $modules/system/sysctl.py: Akasurde

lib/ansible/modules/system/setup.py

@@ -86,7 +86,6 @@
 author:
     - "Ansible Core Team"
     - "Michael DeHaan"
-    - "David O'Brien (@davidobrien1985)"
 '''
 
 EXAMPLES = """