Updated mediawiki/extensions
Project: mediawiki/extensions/Scribunto  04b207829e73e80287a754bc1c07ea54e9f81222
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$wgServerName doesn't exist anymore

This is a followup to I944938f9. I had kind of forgotten that
we removed $wgServerName.

Change-Id: I846cba6853f1a3a09f4e2d362960fea5f60bfcc3