Show log extract on Special:CentralAuth for all users

This is information that is useful for all users, not just
privledged ones.

Also fixes a bug where a user who could just edit global account
status but not oversight would be able to see the suppression log.

Bug: 52734
Change-Id: I3481175d14c3de4b7c9e9ef9ec2a31f05827cdab
Merge "Show log extract on Special:CentralAuth for all users"