Varnish: remove German version of CentralAutoLogin

Remove the /w/index.php?title=Spezial:Zentrale_automatische_Anmeldung/
special handling introduced with
I24419f378dc0e9aacd5ff7dab9dda891d36084ff as the localization of
CentralAutoLogin was removed on the MediaWiki side with
I820370de3afa0bdfce360cba1aef651ac084fd06 and this should now be covered
with the English CentralAutoLogin regexp.

Change-Id: I3e98276a898868a88a7a24947a922027662c0a07