Remove no longer used $wgWBSettings reference

This is going to be messed up on mixed client-repo Wikis
anyway (because both Client and Repo overwrite it completely)

DEPLOYMENT: make sure $wgWBSettings isn't used in the config.

Change-Id: Id6fcd56c20bee9d1aee4a3c306d76addb7b49bc5
Merge "Remove no longer used $wgWBSettings reference"